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
161555699Composite: 1 known prime factor
Factored
FactorDigitsBitsDate
2227187993272651913900392477.62025-09-15 05:02:25
History
DateUserTypeResult
2025-09-15GregF
Factor: 222718799327265191390039 / TF: 76-78
2024-09-01SRBaseNF
no factor from 2^75 to 2^76
2023-03-06SRBaseNF
no factor from 2^74 to 2^75
2021-11-27SRBaseNF
no factor from 2^73 to 2^74
2019-06-12Klaus NordmannNF
no factor from 2^72 to 2^73
2018-12-26ZenghuiNF
no factor from 2^71 to 2^72
2018-06-26ZenghuiNF
no factor from 2^70 to 2^71
2016-08-17AnrodionNF
no factor from 2^69 to 2^70
2016-08-10Adam BuranNF
no factor from 2^68 to 2^69
2016-03-23XZTNF
no factor from 2^67 to 2^68
2015-05-07nikoszNF
no factor from 2^66 to 2^67
2013-03-15GrunwalderGIMPNF
no factor from 2^65 to 2^66
2011-02-04OS1NF
no factor from 2^64 to 2^65
2010-06-30Torchwood InstituteNF
no factor from 2^63 to 2^64