Alright, let's work through 80093216 times 81886751 step by step
80093216 × 81886751 = 81886751 × (80093216)
+ 81886751 × 6 that is equal 491320506
+ 81886751 × 10 that results in 818867510
+ 81886751 × 200 that results in 16377350200
+ 81886751 × 3000 what gives us 245660253000
+ 81886751 × 90000 yielding 7369807590000
+ 81886751 × 000000 yielding 0
+ 81886751 × 0000000 that equals 0
+ 81886751 × 80000000 that equals 6550940080000000

= 6558573235381216
