Alright, let's work through 81145912 times 46859501 step by step
81145912 × 46859501 = 46859501 × (81145912)
+ 46859501 × 2 what gives us 93719002
+ 46859501 × 10 yielding 468595010
+ 46859501 × 900 resulting in 42173550900
+ 46859501 × 5000 what gives us 234297505000
+ 46859501 × 40000 that is equal 1874380040000
+ 46859501 × 100000 that is equal 4685950100000
+ 46859501 × 1000000 what gives us 46859501000000
+ 46859501 × 80000000 that equals 3748760080000000

= 3802456944509912
