Alright, let's work through 80359167 times 85639715 step by step
80359167 × 85639715 = 85639715 × (80359167)
+ 85639715 × 7 that is equal 599478005
+ 85639715 × 60 giving us 5138382900
+ 85639715 × 100 producing 8563971500
+ 85639715 × 9000 giving us 770757435000
+ 85639715 × 50000 that equals 4281985750000
+ 85639715 × 300000 giving us 25691914500000
+ 85639715 × 0000000 yielding 0
+ 85639715 × 80000000 resulting in 6851177200000000

= 6881936159517405
