16950...64007 (1172-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

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As of 2018, the largest known titanic prime of the form Sigma(Fermat prime^n) = 257^486. Certified prime by Primo. [Sariyar]

Submitted: 2018-05-30 09:31:46; Last Modified: 2020-06-28 15:42:47.