56863...18433 (54-digits)
This number is a prime.
5686 3064753535 6955169033 4109408678 0483936074 2060818433
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On March 27, 2010, Michael Vang found a 54-digit factor of F12 using GMP-ECM. F12 is the 12th Fermat number 2^(2^12) + 1 = 2^4096 + 1.
Submitted: 2026-01-28 03:03:40; Last Modified: 2026-01-28 03:51:49.
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