Alright, let's work through 83109886 times 67490641 step by step
83109886 × 67490641 = 67490641 × (83109886)
+ 67490641 × 6 which equals 404943846
+ 67490641 × 80 that is equal 5399251280
+ 67490641 × 800 giving us 53992512800
+ 67490641 × 9000 that equals 607415769000
+ 67490641 × 00000 giving us 0
+ 67490641 × 100000 which equals 6749064100000
+ 67490641 × 3000000 giving us 202471923000000
+ 67490641 × 80000000 which equals 5399251280000000

= 5609139479576926
