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How large is a googol?

A googol is 10¹⁰⁰ (the number 1 followed by 100 zeros). Unlike most other names for numbers, it is not part of any particular numbering scale. The American mathematician Edward Kasner first used the term "googol" in 1938. The name for this very large number was suggested by Kasner's nine-year-old nephew. The term googolplex describes the number 1 followed by a googol of zeros, represented as l0^googol (10¹⁰¹⁰⁰).

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Other Very Large Numbers

Name	Value in powers of 10	Number of Os	Number of groups of three Os after 1,000
Name
Billion	109	9	2
Trillion	1012

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