Alright, let's work through 84053542 times 86181603 step by step
84053542 × 86181603 = 86181603 × (84053542)
+ 86181603 × 2 that equals 172363206
+ 86181603 × 40 which equals 3447264120
+ 86181603 × 500 giving us 43090801500
+ 86181603 × 3000 yielding 258544809000
+ 86181603 × 50000 which equals 4309080150000
+ 86181603 × 000000 which equals 0
+ 86181603 × 4000000 that equals 344726412000000
+ 86181603 × 80000000 that equals 6894528240000000

= 7243868987387826
