Alright, let's work through 81644513 times 45034982 step by step
81644513 × 45034982 = 45034982 × (81644513)
+ 45034982 × 3 which equals 135104946
+ 45034982 × 10 that results in 450349820
+ 45034982 × 500 that is equal 22517491000
+ 45034982 × 4000 yielding 180139928000
+ 45034982 × 40000 that results in 1801399280000
+ 45034982 × 600000 that equals 27020989200000
+ 45034982 × 1000000 giving us 45034982000000
+ 45034982 × 80000000 yielding 3602798560000000

= 3676859173353766
