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Top Mersenne exponents with the most known factors:
Exponent range: M - M, number of factors between and

Known
Factors
Exponent
Count
112
101
921
8133
7757
66,513
550,381
4328,883
Exponent # Known FactorsSum Bitsize of Known Factors Largest factor (bits) % Known PrimeNetGPU72actual
M7,508,98111495.9480.000.0066046378%263 266
M9,100,91911521.5180.160.0057302455%264 267

M566,448,35910450.6864.230.0000795615%279 282

M111,2699445.0379.650.3999613549%240 243
M457,7399445.7286.890.0973751417%240 243
M757,6519506.5583.830.0668572997%240 243
M794,2039430.5888.320.0542152321%240 243
M1,938,3179444.6483.790.0229392303%258 261
M5,977,7539404.7760.800.0067713236%262 265
M9,325,1599431.0872.400.0046227201%264 267
M27,366,9619414.3078.450.0015138692%266 269
M28,035,7019409.7760.860.0014615900%266 269
M31,866,3779429.3761.160.0013473920%267 270
M60,593,0419417.8065.270.0006895231%269 272
M110,393,0699423.0467.630.0003832143%272 275
M113,644,6739392.8863.840.0003457047%272 275
M458,703,4379426.0367.500.0000928772%278 281
M630,486,7999388.0556.110.0000615472%280 283
M639,698,2439422.9671.430.0000661191%280 283
M726,064,7639471.7174.850.0000649686%280 283
M736,098,4319444.1476.850.0000603369%280 283
M736,647,0719463.9572.470.0000629816%280 283
M809,682,1219451.7869.390.0000557968%281 284
M940,572,4919430.1067.950.0000457275%281 284

M3978294.6299.9674.2115869018%240 243
M2,6578384.49136.0514.4707188559%240 243
M3,7678423.82151.5611.2507300239%240 243
M3,7798311.5570.828.2441915851%240 243
M4,9338337.4878.256.8412122441%240 243
M5,9038371.26100.366.2892596985%240 243
M9,6018375.5590.783.9115717113%240 243
M55,3438364.1580.240.6579874600%240 243
M110,5438384.9289.290.3482074849%240 243
M125,4298270.1678.620.2153847994%240 243
M128,8318409.0884.950.3175307185%240 243
M136,7338395.5096.500.2892483892%240 243
M150,5518471.0299.770.3128647435%240 243
M177,0118424.9091.960.2400398845%240 243
M194,6538368.1777.180.1891391348%240 243
M209,5638350.7992.460.1673930990%240 243
M421,6998399.0278.240.0946222305%240 243
M473,2198457.8277.730.0967459041%240 243
M599,8038383.9265.070.0640071824%240 243
M651,7318345.2857.780.0529784528%240 243
M885,8038394.9582.310.0445865503%240 243
M2,171,1598302.7356.590.0139432441%258 261
M2,329,0818308.4174.590.0132416176%258 261
M3,658,2838357.0475.430.0097598792%260 263
M5,049,9598295.0052.510.0058415326%261 264
M7,788,2598331.4158.650.0042552771%263 266
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