Alright, let's work through 72156217 times 66454268 step by step
72156217 × 66454268 = 66454268 × (72156217)
+ 66454268 × 7 giving us 465179876
+ 66454268 × 10 resulting in 664542680
+ 66454268 × 200 giving us 13290853600
+ 66454268 × 6000 which equals 398725608000
+ 66454268 × 50000 giving us 3322713400000
+ 66454268 × 100000 resulting in 6645426800000
+ 66454268 × 2000000 which equals 132908536000000
+ 66454268 × 70000000 producing 4651798760000000

= 4795088582384156
