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A Duoseptuagintillion (1 Duoseptuagintillion) is 10 to the power of 219 (10^219). This is an extremely gargantuan number!

How many zeros in a Duoseptuagintillion?

There are 219 zeros in a Duoseptuagintillion.

What's before Duoseptuagintillion?

A Unseptuagintillion is smaller than a Duoseptuagintillion.

What's after Duoseptuagintillion?

A Treseptuagintillion is larger than a Duoseptuagintillion.


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

Is Duoseptuagintillion the largest number?

Duoseptuagintillion 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.

Duoseptuagintillion written out

Duoseptuagintillion is written out as:


Big Numbers

This is just one of many really big numbers!

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