Alright, let's work through 40004101 times 64157885 step by step
40004101 × 64157885 = 64157885 × (40004101)
+ 64157885 × 1 resulting in 64157885
+ 64157885 × 00 that is equal 0
+ 64157885 × 100 resulting in 6415788500
+ 64157885 × 4000 yielding 256631540000
+ 64157885 × 00000 which equals 0
+ 64157885 × 000000 that is equal 0
+ 64157885 × 0000000 yielding 0
+ 64157885 × 40000000 which equals 2566315400000000

= 2566578511486385
