No problem, we've got 81654712 and 51480545 to multiply
81654712 × 51480545 = 51480545 × (81654712)
+ 51480545 × 2 that equals 102961090
+ 51480545 × 10 producing 514805450
+ 51480545 × 700 what gives us 36036381500
+ 51480545 × 4000 resulting in 205922180000
+ 51480545 × 50000 resulting in 2574027250000
+ 51480545 × 600000 what gives us 30888327000000
+ 51480545 × 1000000 yielding 51480545000000
+ 51480545 × 80000000 that results in 4118443600000000

= 4203629075578040
