Alright, let's work through 54885665 times 20809040 step by step
54885665 × 20809040 = 20809040 × (54885665)
+ 20809040 × 5 producing 104045200
+ 20809040 × 60 what gives us 1248542400
+ 20809040 × 600 that is equal 12485424000
+ 20809040 × 5000 yielding 104045200000
+ 20809040 × 80000 yielding 1664723200000
+ 20809040 × 800000 yielding 16647232000000
+ 20809040 × 4000000 resulting in 83236160000000
+ 20809040 × 50000000 that results in 1040452000000000

= 1142117998411600
