72911...00000 (156-digits)

This number is a composite.

                                                           729111 0581558136
9282577530 3564583597 5837185020 6548141772 3382530431 3874999471 0871569485
5187313722 7991113570 1500646268 5611337384 4602880000 0000000000 0000000000

100!/(2^7) is the center of twin primes. [Gallardo]