Let's calculate 80359927 x 66878931
80359927 × 66878931 = 66878931 × (80359927)
+ 66878931 × 7 that equals 468152517
+ 66878931 × 20 that results in 1337578620
+ 66878931 × 900 that results in 60191037900
+ 66878931 × 9000 which equals 601910379000
+ 66878931 × 50000 giving us 3343946550000
+ 66878931 × 300000 that equals 20063679300000
+ 66878931 × 0000000 that equals 0
+ 66878931 × 80000000 that results in 5350314480000000

= 5374386012998037
