Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
1939969Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
66384699356616011652.6old
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel82FC1B45D82BBF0E013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver Kruse8708889104F3BEBF1013
Verified2017-11-11kkmrkkblmbrbk8708889104F3BEBF146070513
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
82FC1B45D82BBF0E
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2025-06-29alex4NF-PM1
B1=7759890, B2=91023182250
2017-11-11kkmrkkblmbrbkC-PRP
M1939969/6638469935661601 : 8708889104F3BEBF
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1939969/6638469935661601 : 8708889104F3BEBF
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12