Alright, let's work through 54659431 times 25136920 step by step
54659431 × 25136920 = 25136920 × (54659431)
+ 25136920 × 1 what gives us 25136920
+ 25136920 × 30 what gives us 754107600
+ 25136920 × 400 what gives us 10054768000
+ 25136920 × 9000 resulting in 226232280000
+ 25136920 × 50000 that is equal 1256846000000
+ 25136920 × 600000 that equals 15082152000000
+ 25136920 × 4000000 that is equal 100547680000000
+ 25136920 × 50000000 which equals 1256846000000000

= 1373969744292520
