Alright, let's work through 81615204 times 84431655 step by step
81615204 × 84431655 = 84431655 × (81615204)
+ 84431655 × 4 which equals 337726620
+ 84431655 × 00 that equals 0
+ 84431655 × 200 giving us 16886331000
+ 84431655 × 5000 that is equal 422158275000
+ 84431655 × 10000 that is equal 844316550000
+ 84431655 × 600000 resulting in 50658993000000
+ 84431655 × 1000000 yielding 84431655000000
+ 84431655 × 80000000 giving us 6754532400000000

= 6890906746882620
