Alright, let's work through 80158421 times 68599324 step by step
80158421 × 68599324 = 68599324 × (80158421)
+ 68599324 × 1 what gives us 68599324
+ 68599324 × 20 producing 1371986480
+ 68599324 × 400 resulting in 27439729600
+ 68599324 × 8000 yielding 548794592000
+ 68599324 × 50000 that results in 3429966200000
+ 68599324 × 100000 what gives us 6859932400000
+ 68599324 × 0000000 producing 0
+ 68599324 × 80000000 producing 5487945920000000

= 5498813493507404
