Alright, let's work through 85919948 times 80315415 step by step
85919948 × 80315415 = 80315415 × (85919948)
+ 80315415 × 8 that equals 642523320
+ 80315415 × 40 yielding 3212616600
+ 80315415 × 900 resulting in 72283873500
+ 80315415 × 9000 yielding 722838735000
+ 80315415 × 10000 which equals 803154150000
+ 80315415 × 900000 producing 72283873500000
+ 80315415 × 5000000 which equals 401577075000000
+ 80315415 × 80000000 giving us 6425233200000000

= 6900696280398420
