Alright, let's work through 77699377 times 66458835 step by step
77699377 × 66458835 = 66458835 × (77699377)
+ 66458835 × 7 that equals 465211845
+ 66458835 × 70 which equals 4652118450
+ 66458835 × 300 which equals 19937650500
+ 66458835 × 9000 producing 598129515000
+ 66458835 × 90000 that equals 5981295150000
+ 66458835 × 600000 which equals 39875301000000
+ 66458835 × 7000000 what gives us 465211845000000
+ 66458835 × 70000000 that equals 4652118450000000

= 5163810075645795
