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

PrimeNet Exponent Status

Exponent Range:





MnDetails
6661
Composite, with 4 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
339301215291135.0old
1363754493836972856808732476.9old
2213188108142686881883455772787.5old
215165821850645570669358876354843757856413111576149160.62021-03-27 16:50:14
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000004569 / 16550
Estimated T-Level: 46.4 ⓘ
TF below 2^149 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
No proof (small exponent)
2017-09-21Oliver KruseB9B9B9A7F16456793013
Factored
No proof (small exponent)
2017-10-02kkmrkkblmbrbkB9B9B9A7F16456793013
Factored
No proof (small exponent)
2017-12-07ATHB9B9B9A7F16456793559313
Factored
No proof (small exponent)
2020-04-17Oliver Kruse5668BD640061EB033626853
Verified
No proof (small exponent)
2021-03-27mikr5668BD640061EB034164353
Verified
No proof (small exponent)
2021-03-28mikr5668BD640061EB034324053
Verified
No proof (small exponent)
2021-03-30rbanov5668BD640061EB034454953
Verified
No proof (small exponent)
2023-04-08Dobri5668BD640061EB034586653
History
DateUserTypeResult
2025-05-25masserNF-PP1Start=191/17, B1=1500000000, B2=1498500000000
2023-08-11-anonymous-NF-PM1B1=37000000000, B2=148599418701633900
2023-04-15Naegi MakotoNF-PM1B1=10000000000, B2=50135831001656400
2023-04-08DobriC-PRPM6661/33930121529/136375449383697285680873/221318810814268688188345577/2151658218506455706693588763548437578564131115761 : 5668BD640061EB03
2021-12-17Oliver KruseNF-PM1B1=1000000000, B2=1003954060639530
2021-03-30rbanovC-PRPM6661/33930121529/136375449383697285680873/221318810814268688188345577/2151658218506455706693588763548437578564131115761 : 5668BD640061EB03
2021-03-28mikrC-PRPM6661/33930121529/136375449383697285680873/221318810814268688188345577/2151658218506455706693588763548437578564131115761 : 5668BD640061EB03
2021-03-27mikrC-PRPM6661/33930121529/136375449383697285680873/221318810814268688188345577/2151658218506455706693588763548437578564131115761 : 5668BD640061EB03
2021-03-27Ryan PropperF-ECMFactor: 2151658218506455706693588763548437578564131115761
2020-04-17Oliver KruseC-PRPM6661/33930121529/136375449383697285680873/221318810814268688188345577 : 5668BD640061EB03
2017-12-07ATHC-PRPM6661/33930121529/136375449383697285680873/221318810814268688188345577 : B9B9B9A7F1645679
2017-10-02kkmrkkblmbrbkC-PRPM6661/33930121529/136375449383697285680873/221318810814268688188345577 : B9B9B9A7F1645679
2017-09-21Oliver KruseC-PRPM6661/known_factors : B9B9B9A7F1645679