Alright, let's work through 66217771 times 66516969 step by step
66217771 × 66516969 = 66516969 × (66217771)
+ 66516969 × 1 giving us 66516969
+ 66516969 × 70 yielding 4656187830
+ 66516969 × 700 yielding 46561878300
+ 66516969 × 7000 which equals 465618783000
+ 66516969 × 10000 giving us 665169690000
+ 66516969 × 200000 resulting in 13303393800000
+ 66516969 × 6000000 that results in 399101814000000
+ 66516969 × 60000000 that equals 3991018140000000

= 4404605420856099
