Alright, let's work through 81268553 times 64843748 step by step
81268553 × 64843748 = 64843748 × (81268553)
+ 64843748 × 3 giving us 194531244
+ 64843748 × 50 resulting in 3242187400
+ 64843748 × 500 what gives us 32421874000
+ 64843748 × 8000 yielding 518749984000
+ 64843748 × 60000 that equals 3890624880000
+ 64843748 × 200000 what gives us 12968749600000
+ 64843748 × 1000000 what gives us 64843748000000
+ 64843748 × 80000000 producing 5187499840000000

= 5269757571056644
