Alright, let's work through 85751389 times 81982921 step by step
85751389 × 81982921 = 81982921 × (85751389)
+ 81982921 × 9 giving us 737846289
+ 81982921 × 80 giving us 6558633680
+ 81982921 × 300 resulting in 24594876300
+ 81982921 × 1000 resulting in 81982921000
+ 81982921 × 50000 producing 4099146050000
+ 81982921 × 700000 resulting in 57388044700000
+ 81982921 × 5000000 which equals 409914605000000
+ 81982921 × 80000000 resulting in 6558633680000000

= 7030149350027269
