Answer:
5^10 7^14 or 6623272195791015936 depending on whats being asked
Explanation:
(5)(5)(5)(5)(5)(5)(5)(5)(5)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=(25)(5)(5)(5)(5)(5)(5)(5)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=(125)(5)(5)(5)(5)(5)(5)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=(625)(5)(5)(5)(5)(5)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=(3125)(5)(5)(5)(5)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=(15625)(5)(5)(5)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=(78125)(5)(5)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=(390625)(5)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=(1953125)(5)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=9765625(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=9765625(49)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=9765625(343)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=9765625(2401)(7)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=9765625(16807)(7)(7)(7)(7)(7)(7)(7)(7)(7)
=9765625(117649)(7)(7)(7)(7)(7)(7)(7)(7)
=9765625(823543)(7)(7)(7)(7)(7)(7)(7)
=9765625(5764801)(7)(7)(7)(7)(7)(7)
=9765625(40353607)(7)(7)(7)(7)(7)
=9765625(282475249)(7)(7)(7)(7)
(etc etc etc, you get the point)
alternatively,
5^10 7^14 =6623272195791015936