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A Duononagintillion (1 Duononagintillion) is 10 to the power of 279 (10^279). This is a stupendously astronomical number!

How many zeros in a Duononagintillion?

There are 279 zeros in a Duononagintillion.

What's before Duononagintillion?

A Unnonagintillion is smaller than a Duononagintillion.

What's after Duononagintillion?

A Trenonagintillion is larger than a Duononagintillion.


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

Is Duononagintillion the largest number?

Duononagintillion 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.

Duononagintillion written out

Duononagintillion is written out as:


Big Numbers

This is just one of many really big numbers!

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