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A Sesquinquagintillion (1 Sesquinquagintillion) is 10 to the power of 171 (10^171). This is an extremely gigantic number!

How many zeros in a Sesquinquagintillion?

There are 171 zeros in a Sesquinquagintillion.

What's before Sesquinquagintillion?

A Quinquinquagintillion is smaller than a Sesquinquagintillion.

What's after Sesquinquagintillion?

A Septenquinquagintillion is larger than a Sesquinquagintillion.


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

Is Sesquinquagintillion the largest number?

Sesquinquagintillion 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.

Sesquinquagintillion written out

Sesquinquagintillion is written out as:


Big Numbers

This is just one of many really big numbers!

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