Alright, let's work through 80683383 times 16340249 step by step
80683383 × 16340249 = 16340249 × (80683383)
+ 16340249 × 3 that is equal 49020747
+ 16340249 × 80 that results in 1307219920
+ 16340249 × 300 that equals 4902074700
+ 16340249 × 3000 producing 49020747000
+ 16340249 × 80000 yielding 1307219920000
+ 16340249 × 600000 giving us 9804149400000
+ 16340249 × 0000000 giving us 0
+ 16340249 × 80000000 producing 1307219920000000

= 1318386568382367
