Alright, let's work through 66161101 times 10265003 step by step
66161101 × 10265003 = 10265003 × (66161101)
+ 10265003 × 1 giving us 10265003
+ 10265003 × 00 resulting in 0
+ 10265003 × 100 yielding 1026500300
+ 10265003 × 1000 producing 10265003000
+ 10265003 × 60000 giving us 615900180000
+ 10265003 × 100000 producing 1026500300000
+ 10265003 × 6000000 producing 61590018000000
+ 10265003 × 60000000 producing 615900180000000

= 679143900248303
