Alright, let's work through 80511393 times 47149621 step by step
80511393 × 47149621 = 47149621 × (80511393)
+ 47149621 × 3 that results in 141448863
+ 47149621 × 90 which equals 4243465890
+ 47149621 × 300 that equals 14144886300
+ 47149621 × 1000 resulting in 47149621000
+ 47149621 × 10000 resulting in 471496210000
+ 47149621 × 500000 that equals 23574810500000
+ 47149621 × 0000000 producing 0
+ 47149621 × 80000000 yielding 3771969680000000

= 3796081666132053
