5^12=244140625
4^8=65536
20^8=25600000000
244140625*65536=16000000000000
16000000000000:25600000000=625
5^12=244140625
4^8=65536
20^8=25600000000
244140625*65536=16000000000000
16000000000000:25600000000=625