Alright, let's work through 84045309 times 65812994 step by step
84045309 × 65812994 = 65812994 × (84045309)
+ 65812994 × 9 what gives us 592316946
+ 65812994 × 00 producing 0
+ 65812994 × 300 resulting in 19743898200
+ 65812994 × 5000 giving us 329064970000
+ 65812994 × 40000 resulting in 2632519760000
+ 65812994 × 000000 that results in 0
+ 65812994 × 4000000 that equals 263251976000000
+ 65812994 × 80000000 producing 5265039520000000

= 5531273416945146
