Alright, let's work through 81031402 times 65013354 step by step
81031402 × 65013354 = 65013354 × (81031402)
+ 65013354 × 2 resulting in 130026708
+ 65013354 × 00 what gives us 0
+ 65013354 × 400 yielding 26005341600
+ 65013354 × 1000 resulting in 65013354000
+ 65013354 × 30000 yielding 1950400620000
+ 65013354 × 000000 what gives us 0
+ 65013354 × 1000000 yielding 65013354000000
+ 65013354 × 80000000 that is equal 5201068320000000

= 5268123223342308
