Alright, let's work through 99680418 times 67165511 step by step
99680418 × 67165511 = 67165511 × (99680418)
+ 67165511 × 8 what gives us 537324088
+ 67165511 × 10 that is equal 671655110
+ 67165511 × 400 yielding 26866204400
+ 67165511 × 0000 resulting in 0
+ 67165511 × 80000 that results in 5373240880000
+ 67165511 × 600000 resulting in 40299306600000
+ 67165511 × 9000000 giving us 604489599000000
+ 67165511 × 90000000 resulting in 6044895990000000

= 6695086211663598
