Alright, let's work through 80399668 times 92006541 step by step
80399668 × 92006541 = 92006541 × (80399668)
+ 92006541 × 8 resulting in 736052328
+ 92006541 × 60 resulting in 5520392460
+ 92006541 × 600 that results in 55203924600
+ 92006541 × 9000 that results in 828058869000
+ 92006541 × 90000 which equals 8280588690000
+ 92006541 × 300000 giving us 27601962300000
+ 92006541 × 0000000 that equals 0
+ 92006541 × 80000000 producing 7360523280000000

= 7397295350228388
