The composite cofactor of 10,590M was the product of 101-digit and 112-digit prime numbers:

101-digit prime factor:
75037358034332057078790154693096980495187922731710294362515981973078279750268757439593899891657607361

112-digit prime factor:
2907131293216055549329555883885796814746678687962202509667060729657495398875648698596222904827974545076532182201

The factors will be reported to the Cunningham project and have been recorded on Page 123.