Question

tell me largest known number in digits

Answer 1

Hello! I can help you :)
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There is no known largest number in digits.

But, there does exist the largest number with a name

The number is:

Googolplexian

Let me explain you about googolplexian:

Googol: 1 followed by 100 zeroes

Googolplex: 1 followed by a googol of zeroes.

Googolplexian: 1 followed by googolplex of zeroes.
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Answer 2

HI sarthak this may help you 
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The largest known nuber in digits is a prime no which is 17,425,170 
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