Alright, let's work through 80394773 times 16810199 step by step
80394773 × 16810199 = 16810199 × (80394773)
+ 16810199 × 3 that results in 50430597
+ 16810199 × 70 that equals 1176713930
+ 16810199 × 700 yielding 11767139300
+ 16810199 × 4000 what gives us 67240796000
+ 16810199 × 90000 yielding 1512917910000
+ 16810199 × 300000 what gives us 5043059700000
+ 16810199 × 0000000 that results in 0
+ 16810199 × 80000000 that results in 1344815920000000

= 1351452132689827
