Alright, let's work through 80850409 times 13959199 step by step
80850409 × 13959199 = 13959199 × (80850409)
+ 13959199 × 9 which equals 125632791
+ 13959199 × 00 which equals 0
+ 13959199 × 400 that equals 5583679600
+ 13959199 × 0000 resulting in 0
+ 13959199 × 50000 that is equal 697959950000
+ 13959199 × 800000 that is equal 11167359200000
+ 13959199 × 0000000 that is equal 0
+ 13959199 × 80000000 giving us 1116735920000000

= 1128606948462391
