Alright, let's work through 83518418 times 47994793 step by step
83518418 × 47994793 = 47994793 × (83518418)
+ 47994793 × 8 that results in 383958344
+ 47994793 × 10 what gives us 479947930
+ 47994793 × 400 that is equal 19197917200
+ 47994793 × 8000 that is equal 383958344000
+ 47994793 × 10000 that results in 479947930000
+ 47994793 × 500000 giving us 23997396500000
+ 47994793 × 3000000 that equals 143984379000000
+ 47994793 × 80000000 producing 3839583440000000

= 4008449183597474
