Pronunciation: /ˈgug.gɒl/ Explain

A googol is the number 10100, which is the same as a one followed by one hundred zeros.
Googol is used to indicate a very large number. It is often used to show a number that is quite large but not infinite. The word "googol" was invented by nine-year-old Milton Sirott, nephew of mathematician Edward Kasner in 1938.

A googolplex is 10 raised to a googol power. If a googolplex were written out as ones and zeros in a book, it would take a book larger than the observable universe.


  1. McAdams, David E.. All Math Words Dictionary, googol. 2nd Classroom edition 20150108-4799968. pg 86. Life is a Story Problem LLC. January 8, 2015. Buy the book

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McAdams, David E. Googol. 12/21/2018. All Math Words Encyclopedia. Life is a Story Problem LLC.

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Revision History

12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
7/10/2018: Removed broken links, updated license, implemented new markup, implemented new Geogebra protocol. (McAdams, David E.)
5/5/2011: Initial version. (McAdams, David E.)
2/14/2011: Minor formatting changes. (McAdams, David E.)
2/8/2010: Added "References". (McAdams, David E.)
12/2/2009: Authored. (McAdams, David E.)

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