Alright, let's work through 80380721 times 55296071 step by step
80380721 × 55296071 = 55296071 × (80380721)
+ 55296071 × 1 resulting in 55296071
+ 55296071 × 20 resulting in 1105921420
+ 55296071 × 700 that is equal 38707249700
+ 55296071 × 0000 giving us 0
+ 55296071 × 80000 resulting in 4423685680000
+ 55296071 × 300000 giving us 16588821300000
+ 55296071 × 0000000 that is equal 0
+ 55296071 × 80000000 that results in 4423685680000000

= 4444738055447191
