Alright, let's work through 80974887 times 79579666 step by step
80974887 × 79579666 = 79579666 × (80974887)
+ 79579666 × 7 that is equal 557057662
+ 79579666 × 80 that equals 6366373280
+ 79579666 × 800 that results in 63663732800
+ 79579666 × 4000 which equals 318318664000
+ 79579666 × 70000 that results in 5570576620000
+ 79579666 × 900000 what gives us 71621699400000
+ 79579666 × 0000000 resulting in 0
+ 79579666 × 80000000 producing 6366373280000000

= 6443954461847742
