No problem, we've got 78805189 and 81872777 to multiply
78805189 × 81872777 = 81872777 × (78805189)
+ 81872777 × 9 resulting in 736854993
+ 81872777 × 80 what gives us 6549822160
+ 81872777 × 100 yielding 8187277700
+ 81872777 × 5000 which equals 409363885000
+ 81872777 × 00000 yielding 0
+ 81872777 × 800000 giving us 65498221600000
+ 81872777 × 8000000 what gives us 654982216000000
+ 81872777 × 70000000 resulting in 5731094390000000

= 6451999665439853
