is 2 66863827 - 1
has 20128018 decimal digits
takes 169.017 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L049B5CE041DA8D__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual276228.883065.7895%57500089125003.77252.9871%232.655566.8114%1.0219%
PrimeNet2703.573762.8571%280000130000003.56645.3176%7.140164.8322%1.9751%
GPU7227457.218864.8649%450000150000004.55493.9274%61.773766.2448%1.3799%
Difference+2+171.6642+0.9246%+125000-6087500-0.7824-0.9403%+170.8818+0.5666%+0.5666%

Known prime factors:
No known factors for M66863827

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2013-12-13T16:44:00gucsecho35750008912500---3.772--2.987%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-05-10T23:40:001997rj7Manual testing21264--0.053--
2010-02-04T16:24:00Hocapro2000264265--0.056--
2010-02-06T14:04:00GrunwalderGIMPcompute-0-1265266--0.112--
2010-02-13T01:15:00curtiscjckl-ccb32l266267--0.224--
2010-04-18T15:48:00Per Jessenbeaufort1267268--0.447--
2010-04-23T00:27:00Per Jessenbeaufort1268269--0.894--
2012-07-27T15:08:00kdgehmanManual testing269270--1.788--
2013-04-05T02:47:00Brian V.Manual testing270271--3.576--
2013-04-05T02:47:00Brian V.Manual testing271272--7.153--
2013-09-18T22:40:00Jerry HallettManual testing272273--14.31--
2013-09-26T22:42:00Jerry HallettManual testing273274--28.61--
2021-07-19T01:03:53AyczlyManual testing274275--57.22--
2021-07-19T01:03:53AyczlyManual testing275276--114.4--


ECM factoring results:
No ECM results for M66863827


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2014-07-03T09:16:00ANONYMOUS049B5CE041DA8D__169.0


PRP results:
No PRP results for M66863827


P-1 factor-bounds graph:
B1 = 575000, B2 = 8912500 (P-1 stage 2)
B1 = 575000 (P-1 stage 1)
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107
TF factor-bounds graph:
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Last modified: 2021-07-19T01:03:53+00:00