No problem, we've got 81163514 and 73072280 to multiply
81163514 × 73072280 = 73072280 × (81163514)
+ 73072280 × 4 yielding 292289120
+ 73072280 × 10 producing 730722800
+ 73072280 × 500 what gives us 36536140000
+ 73072280 × 3000 resulting in 219216840000
+ 73072280 × 60000 which equals 4384336800000
+ 73072280 × 100000 giving us 7307228000000
+ 73072280 × 1000000 yielding 73072280000000
+ 73072280 × 80000000 what gives us 5845782400000000

= 5930803020791920
