Alright, let's work through 85720577 times 64164497 step by step
85720577 × 64164497 = 64164497 × (85720577)
+ 64164497 × 7 that is equal 449151479
+ 64164497 × 70 which equals 4491514790
+ 64164497 × 500 that results in 32082248500
+ 64164497 × 0000 giving us 0
+ 64164497 × 20000 that is equal 1283289940000
+ 64164497 × 700000 which equals 44915147900000
+ 64164497 × 5000000 giving us 320822485000000
+ 64164497 × 80000000 giving us 5133159760000000

= 5500217705754769
