Alright, let's work through 8160057 times 20156843 step by step
8160057 × 20156843 = 20156843 × (8160057)
+ 20156843 × 7 that results in 141097901
+ 20156843 × 50 giving us 1007842150
+ 20156843 × 000 resulting in 0
+ 20156843 × 0000 that equals 0
+ 20156843 × 60000 resulting in 1209410580000
+ 20156843 × 100000 that results in 2015684300000
+ 20156843 × 8000000 what gives us 161254744000000

= 164480987820051
