is 2 66209881 - 1
has 19931161 decimal digits
takes 167.364 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2670.448861.1940%----0.448861.1940%
Target27457.783964.8649%450000150000004.55493.9226%62.338866.2431%
Difference-7-57.3351-3.6708%-450000-15000000-4.5549-3.9226%-61.8901-5.0490%

Known prime factors (1 factor, 49.1 bits, 0.00007421% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
662098816189748578873191549.1374674339
32 × 519371		-95193711.995e-60.10370.1937

P-1 results:
No P-1 results for M66209881


Trial Factoring results:
No TF results for M66209881


ECM factoring results:
No ECM results for M66209881


Lucas-Lehmer results:
No L-L results for M66209881


PRP results:
No PRP results for M66209881


P-1 factor-bounds graph:
100
101
100
101
102
103
104
105
106
TF factor-bounds graph:
this exponent TF target: 74
TF double-checked to: 67.8
250
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280
Last modified: 2023-04-26T21:34:10+00:00