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A Senonagintillion (1 Senonagintillion) is 10 to the power of 291 (10^291). This is an excessively astronomical number!

How many zeros in a Senonagintillion?

There are 291 zeros in a Senonagintillion.

What's before Senonagintillion?

A Quinnonagintillion is smaller than a Senonagintillion.

What's after Senonagintillion?

A Septenonagintillion is larger than a Senonagintillion.


A Senonagintillionaire is someone whos assets, net worth or wealth is 1 or more Senonagintillion. It is unlikely anyone will ever be a true Senonagintillionaire. If you want to be a Senonagintillionaire, play Tap Tales!

Is Senonagintillion the largest number?

Senonagintillion is not the largest number. Infinity best describes the largest possible number - if there even is one! We cannot comprehend what the largest number actually is.

Senonagintillion written out

Senonagintillion is written out as:


Big Numbers

This is just one of many really big numbers!

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