Alright, let's work through 8345367 times 80017495 step by step
8345367 × 80017495 = 80017495 × (8345367)
+ 80017495 × 7 resulting in 560122465
+ 80017495 × 60 yielding 4801049700
+ 80017495 × 300 that equals 24005248500
+ 80017495 × 5000 which equals 400087475000
+ 80017495 × 40000 yielding 3200699800000
+ 80017495 × 300000 that is equal 24005248500000
+ 80017495 × 8000000 resulting in 640139960000000

= 667775362195665
