Factors of M(3326400)  was M(5040)
I started the Lounge thread about factors of M(5040). In that thread I also posted factors from related exponents. Now that we have a factoring forum I will post these factors here.
106638643913461155414345241 is a factor of M(1485).
607648390273 is a factor of 2^16632+1, and hence a factor of M(33264)
The P27 was found using GMPECM5 with B1=25000. The remaining unfactored cofactor is reduced from a C210 to a C184. The P12 was found with Dario Alejandro Alpernâ€™s web based Java factorer. It leaves a remaining C2583 cofactor. Both results have been reported to Will Edgington so they will show up in the next release of lowM.txt.
