99999...99901 (27-digits)
This number is a prime.
9999999 9999999999 9999999901
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The largest 27-digit prime. The first time the "largest n-digit prime" contains the digit zero. (The largest prime
for n = 1, 2, 3, ... , 26 digits are all zeroless.) [Gudipati]
Submitted: 2026-06-03 12:59:32; Last Modified: 2026-06-03 13:51:30.
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