Alright, let's work through 99618518 times 77427691 step by step
99618518 × 77427691 = 77427691 × (99618518)
+ 77427691 × 8 that is equal 619421528
+ 77427691 × 10 producing 774276910
+ 77427691 × 500 that is equal 38713845500
+ 77427691 × 8000 that is equal 619421528000
+ 77427691 × 10000 that equals 774276910000
+ 77427691 × 600000 that equals 46456614600000
+ 77427691 × 9000000 which equals 696849219000000
+ 77427691 × 90000000 yielding 6968492190000000

= 7713231829581938
