Large Numbers: Frequently Asked Questions
Quick, accurate answers to the most common questions about naming gigantic numbers.
What is a googol?
A googol is 10100 - a 1 followed by 100 zeros. It is larger than the estimated number of atoms in the observable universe (about 1080). The company name "Google" is a play on this word.
What comes after a centillion?
In the short scale a centillion is 10303. Beyond it the Conway-Wechsler system keeps building names systematically - for example the millinillion (103003). There is no "largest" name; the rules generate a valid name for any power of ten.
What is the difference between the short scale and the long scale?
In the short scale (US, modern UK) each new "-illion" is 1,000 times bigger, so a billion is 109. In the long scale (much of Europe) each "-illion" is 1,000,000 times bigger, so a billion is 1012, and "-illiard" names fill the gaps. Cosmic Scale shows both at once.
How many zeros are in a trillion?
In the short scale a trillion has 12 zeros (1012). In the long scale a trillion has 18 zeros (1018).
Is a "zillion" a real number?
No. "Zillion," "gazillion," and "bazillion" are informal words for "an unimaginably large number." They have no defined value. The Conway-Wechsler system exists precisely so that every magnitude can have a single real, defined name.
What is the Conway-Wechsler system?
It is a consistent method for naming any power of ten, created by mathematicians John Conway and Allan Wechsler. It assembles Latin roots for units, tens, and hundreds, then applies linking-letter rules so the result is pronounceable. Cosmic Scale implements these rules directly.
What is the largest SI metric prefix?
As of the 2022 update, the largest SI prefix is quetta (Q), meaning 1030. The smallest is quecto (10-30). Cosmic Scale shows the matching SI prefix for any exponent within range.
Does Cosmic Scale work offline?
The web version needs a connection to load once, then runs entirely in your browser. The premium Chrome/Edge extension works fully offline after activation, with no ads.
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