Alright, let's work through 79980245 times 7985313 step by step
79980245 × 7985313 = 7985313 × (79980245)
+ 7985313 × 5 producing 39926565
+ 7985313 × 40 giving us 319412520
+ 7985313 × 200 that equals 1597062600
+ 7985313 × 0000 yielding 0
+ 7985313 × 80000 that equals 638825040000
+ 7985313 × 900000 that is equal 7186781700000
+ 7985313 × 9000000 giving us 71867817000000
+ 7985313 × 70000000 which equals 558971910000000

= 638667290141685
