Alright, let's work through 81684706 times 80299701 step by step
81684706 × 80299701 = 80299701 × (81684706)
+ 80299701 × 6 what gives us 481798206
+ 80299701 × 00 which equals 0
+ 80299701 × 700 producing 56209790700
+ 80299701 × 4000 giving us 321198804000
+ 80299701 × 80000 producing 6423976080000
+ 80299701 × 600000 giving us 48179820600000
+ 80299701 × 1000000 yielding 80299701000000
+ 80299701 × 80000000 giving us 6423976080000000

= 6559257468072906
