Alright, let's work through 81073672 times 70527643 step by step
81073672 × 70527643 = 70527643 × (81073672)
+ 70527643 × 2 resulting in 141055286
+ 70527643 × 70 resulting in 4936935010
+ 70527643 × 600 what gives us 42316585800
+ 70527643 × 3000 what gives us 211582929000
+ 70527643 × 70000 that is equal 4936935010000
+ 70527643 × 000000 resulting in 0
+ 70527643 × 1000000 that results in 70527643000000
+ 70527643 × 80000000 that is equal 5642211440000000

= 5717934995515096
