No problem, we've got 80104725 and 66427800 to multiply
80104725 × 66427800 = 66427800 × (80104725)
+ 66427800 × 5 what gives us 332139000
+ 66427800 × 20 which equals 1328556000
+ 66427800 × 700 resulting in 46499460000
+ 66427800 × 4000 yielding 265711200000
+ 66427800 × 00000 what gives us 0
+ 66427800 × 100000 what gives us 6642780000000
+ 66427800 × 0000000 yielding 0
+ 66427800 × 80000000 that results in 5314224000000000

= 5321180651355000
