Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
647224517Composite: 1 known prime factor
Factored
FactorDigitsBitsDate
8128584053921980625772169.52016-09-14 19:58:47
History
DateUserTypeResult
2016-09-14NipalF
Factor: 812858405392198062577 / TF: 67-70
2014-06-15sasakiNF
no factor from 2^66 to 2^67
2014-03-19america64NF
no factor from 2^65 to 2^66