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
1633603Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
6558360619991239.3old
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)2025-09-02Kriesel0075E8724F2870FD013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-02Oliver KruseD8E05753109807591013
Verified2017-11-01kkmrkkblmbrbkD8E0575310980759175076013
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
0075E8724F2870FD
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-01kkmrkkblmbrbkC-PRP
M1633603/655836061999 : D8E0575310980759
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1633603/655836061999 : D8E0575310980759
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=500000, B2=15000000, E=12