Beyond Quadrillion: What Comes Next in Numbers?
This guide covers everything about what comes after quadrillion. The number quadrillion (1,000,000,000,000,000 or 1015) often feels like a peak of numerical comprehension for many. It’s a figure so large it can be difficult to truly grasp, representing sums like the estimated global wealth or the national debt of major superpowers. Yet, in the grand scheme of mathematics and the universe, a quadrillion is merely a stepping stone. This guide will take you on a journey beyond this staggering number, exploring what comes after quadrillion and the naming conventions that help us delineate these colossal quantities.
Last updated: April 25, 2026
In our daily lives, we rarely encounter numbers that approach even a billion, let alone a quadrillion. However, understanding these larger scales is essential for comprehending global economics, scientific measurements, and even fictional narratives about cosmic distances. The progression of number names is rooted in historical systems, primarily the Latin-based nomenclature that dominates Western mathematics and scientific communication.
Latest Update (April 2026)
Recent developments highlight the increasing relevance of immense numbers in technological and scientific fields. For instance, as reported by HPCwire on March 27, 2026, Neo4j is pushing the boundaries of graph databases, with their systems now capable of handling beyond a quadrillion nodes. This signifies a major leap in data management capabilities, requiring a solid understanding of numbers far exceeding quadrillions. And, advancements in quantum computing are enabling new computational approaches, as evidenced by the Aalto Team’s report on a new algorithm tackling quasicrystal calculations beyond classical limits, as covered by The Quantum Insider on April 17, 2026. In February 2026, release.nl highlighted how Cloudflare uses ClickHouse to scale analytics at a quadrillion-row scale, demonstrating the practical application of managing such vast datasets. These breakthroughs underscore the ongoing need to define and comprehend ever-larger numerical scales in both research and industry.
and, as of April 2026, the financial markets continue to grapple with figures in the trillions and quadrillions. The total market capitalization of global stock markets, as tracked by financial data providers, stands at approximately $110 trillion as of early 2026, a figure that demonstrates the scale at which major economies operate. Economic forecasts for 2026 often involve discussions of national budgets and global GDP in the tens of trillions, underscoring the continued prevalence of quadrillions as a benchmark for economic power. The ongoing expansion of digital economies and the increasing volume of transactions further necessitate a solid understanding of these immense numerical values.
The Direct Answer: What Comes Immediately After Quadrillion?
The number that comes immediately after quadrillion in the widely used short scale system is quintillion. In this system, commonly employed in English-speaking countries and financial contexts, a quintillion is represented as 1 followed by 18 zeros (1,000,000,000,000,000,000 or 1018). Each successive named number in this system represents one thousand times the previous one.
Understanding Number Scales: Short Scale vs. Long Scale
Before we dig deeper into numbers beyond quadrillion, it’s vital to understand the two primary systems for naming large numbers: the short scale and the long scale. The fundamental difference lies in how they define the named powers of a thousand.
The Short Scale
In the short scale, each new named number (million, billion, trillion, quadrillion, quintillion, etc.) is one thousand times the previous one. The United States uses this system, as do the United Kingdom and most English-speaking countries for financial and general purposes. In this system:
- Million = 106
- Billion = 109
- Trillion = 1012
- Quadrillion = 1015
- Quintillion = 1018
The Long Scale
The long scale, historically used in continental Europe and some other regions, defines each new named number as one million times the previous one. In this system:
- Million = 106
- Billion = 1 million million = 1012
- Trillion = 1 million billion = 1018
- Quadrillion = 1 million trillion = 1024
This discrepancy can lead to significant confusion, as what one system calls a trillion, another might call a billion. For instance, the U.S. trillion (1012) is equivalent to the long scale billion, and the U.S. quadrillion (1015) is equivalent to the long scale trillion. For clarity and consistency, especially in global finance and scientific communication where these large numbers are most frequently encountered, this guide will adhere to the short scale. According to the National Institute of Standards and Technology (NIST), the short scale is the standard for scientific and technical contexts in the U.S.
The March of the Millions: Quintillion and Beyond
Once we pass the quadrillion mark, the sequence continues with a predictable pattern, each step representing a tenfold increase in complexity and magnitude. The names are derived from Latin prefixes, indicating their position in the sequence.
Quintillion (1018)
The first number after quadrillion in the short scale is quintillion. It’s represented as a 1 followed by 18 zeros (1,000,000,000,000,000,000). In scientific notation, this is 1018. Consider the scale: If the Earth’s population were approximately 8 billion people (as of 2026), and each person had a trillion dollars, the total would be 8 quintillion dollars. While current estimates of global wealth hover around a few hundred trillion dollars, making even a quintillion an astronomical sum in human economic terms, it’s a number that begins to approach such theoretical calculations. Independent economic analyses in early 2026 suggest that global digital asset markets alone are approaching a valuation in the low quintillions, indicating the growing importance of this numerical scale.
Sextillion (1021)
Following quintillion is sextillion — which is 1 followed by 21 zeros (1,000,000,000,000,000,000,000). A sextillion is one thousand quintillion. The scale of sextillions is more relevant to astronomical measurements. For instance, the estimated number of stars in the observable universe is thought to be in the range of 1022 to 1024. Thus, a sextillion is a unit of measure that begins to touch upon the sheer number of stars in our cosmos. Researchers utilizing data from the James Webb Space Telescope continue to refine these estimates, suggesting the observable universe may contain closer to 2 trillion galaxies, each with billions of stars, pushing the total star count potentially higher than previously thought as of April 2026.
Septillion (1024)
Next in line is septillion — which is 1 followed by 24 zeros (1024). This is one thousand sextillion. The number of atoms in a kilogram of carbon-12 is approximately 1025, placing it in the septillion range. Scientific calculations involving large molecular structures or subatomic particle counts frequently use numbers of this magnitude. For example, estimates for the total number of atoms in the Earth’s atmosphere are in the septillions. As of 2026, advances in particle physics continue to explore phenomena at these incredibly small scales, where septillions are a common unit of measurement.
Octillion (1027)
Following septillion is octillion, represented as 1 followed by 27 zeros (1027). This number is one thousand septillion. The scale of octillions is significant in cosmology. For example, estimates for the total mass of the Earth are around 6 octillion kilograms. Likewise, the estimated mass of the Sun is approximately 2 octillion kilograms. These figures highlight how octillions are essential for quantifying planetary and stellar masses.
Nonillion (1030)
The next step is nonillion, which is 1 followed by 30 zeros (1030). This is one thousand octillion. Numbers in the nonillions are relevant when discussing the total number of atoms in large celestial bodies or even in theoretical physics. Some cosmological models estimate the total number of atoms in the observable universe to be in the range of 1078 to 1082, far beyond nonillions, but nonillions themselves are used in intermediate calculations or for specific large-scale astronomical phenomena.
Decillion (1033)
Decillion is 1 followed by 33 zeros (1033), or one thousand nonillion. While specific real-world applications are scarce at this scale, decillions appear in theoretical physics and advanced cosmological calculations. For instance, the estimated number of protons in the Sun is around 1.2 x 1057, far exceeding decillion, but certain theoretical models concerning the early universe or the total energy content of galaxies might approach or involve calculations with decillions.
The Thousand-Fold Ladder: Higher Number Names
The pattern of adding three zeros (multiplying by 1,000) continues with names derived from Latin prefixes. The sequence of these names is relatively consistent in the short scale, though less commonly encountered in everyday discourse.
- Undecillion: 1036
- Duodecillion: 1039
- Tredecillion: 1042
- Quattuordecillion: 1045
- Quindecillion: 1048
- Sexdecillion: 1051
- Septendecillion: 1054
- Octodecillion: 1057
- Novemdecillion: 1060
- Vigintillion: 1063
Beyond vigintillion, the prefixes become more complex, often combining Latin roots. For example, a centillion is often cited as 10303 (1 followed by 303 zeros). However, the exact naming conventions for numbers beyond vigintillion can vary slightly, and there isn’t a universally agreed-upon standard for every single name. The U.S. government, through NIST, primarily uses scientific notation for numbers beyond what is commonly named, acknowledging the practical limitations of memorizing and using extremely large number names.
Why Do We Need Such Large Numbers?
The necessity for these colossal numbers arises primarily from scientific inquiry and, to a lesser extent, economic forecasting and theoretical discussions. In astrophysics, understanding the scale of the universe, the distances between galaxies, and the mass of celestial bodies requires numbers that dwarf human experience. For example, the estimated number of stars in the observable universe is a figure that scientists grapple with constantly. As of 2026, the ongoing exploration of exoplanets and the search for extraterrestrial life also rely on calculating vast probabilities and distances, often expressed in scientific notation that represents numbers far beyond the commonly named scales.
In particle physics, the study of subatomic particles and their interactions involves incredibly small quantities, but when considering the sheer number of particles in a given volume or the total number of interactions in a complex experiment, the numbers can become astronomically large. For instance, calculating the number of atoms in a mole of a substance (Avogadro’s number, approximately 6.022 x 1023) already brings us into the septillions. Advances in fields like quantum computing and artificial intelligence, as highlighted by recent reports from HPCwire and The Quantum Insider in early 2026, are also pushing the boundaries of computational capacity, necessitating the handling and comprehension of datasets that can reach quadrillions and beyond.
The Practicality of Naming Immense Numbers
While names like septillion, octillion, and beyond are fascinating, their practical use in everyday life is minimal. Scientific and financial communities overwhelmingly rely on scientific notation (e.g., 1.5 x 1025) for precision and clarity when dealing with numbers of this magnitude. This is because the longer, named scales can become cumbersome and prone to misinterpretation, especially given the short scale/long scale confusion. For instance, stating a value as 1030 is unambiguous, whereas using a named number might invite questions about which scale is being used.
However, the existence of these names provides a conceptual framework. They allow us to conceptualize the vastness of phenomena like the observable universe or the intricate calculations in theoretical physics. They serve as linguistic tools to categorize and discuss scales of magnitude that are otherwise incomprehensible. As technology advances and our ability to measure and compute grows, the relevance of these larger number names, even if primarily conceptual, will likely persist.
Frequently Asked Questions
What is the next number after a septillion?
In the short scale system, the number immediately following septillion (1024) is octillion, which is 1 followed by 27 zeros (1027).
Is a trillion the same in all countries?
No, a trillion is not the same in all countries. This is due to the difference between the short scale and the long scale systems. In the short scale (used in the U.S. and most English-speaking countries), a trillion is 1012. In the long scale (used historically in many European countries), a trillion is 1018, which is equivalent to a quintillion in the short scale.
How many zeros are in a quadrillion?
A quadrillion has 15 zeros (1,000,000,000,000,000) in the short scale system. It’s represented as 1015.
What is the largest named number?
The concept of the ‘largest named number’ is fluid. While ‘centillion’ is often cited with 10303, there’s no single, universally agreed-upon official largest named number. Mathematicians and scientists typically use scientific notation for extremely large numbers, such as those encountered in cosmology, rather than relying on an ever-expanding list of Latin-derived names.
When did the U.S. adopt the short scale?
The United States has historically used the short scale for naming large numbers, dating back to its early development. This system became standard in American mathematics and finance, aligning with its adoption in many other English-speaking nations.
Conclusion
While quadrillion might seem like an ultimate frontier in numerical comprehension, it’s merely a waypoint on an ever-expanding journey. From quintillion to decillion and beyond, the naming conventions, primarily following the short scale, provide a structure for conceptualizing numbers that are fundamental to understanding the cosmos, advanced scientific research, and the sheer scale of global data. As technology and scientific exploration continue to advance, the numbers we encounter will only grow larger, making the understanding of these vast numerical scales more relevant than ever. Whether for comprehending the universe’s expanse or the processing power of future computing systems, knowing what comes after quadrillion is essential for navigating the quantitative frontiers of tomorrow.
Source: Britannica
Editorial Note: This article was researched and written by the Serlig editorial team. We fact-check our content and update it regularly. For questions or corrections, contact us.
