Alright, let's work through 80400521 times 94661497 step by step
80400521 × 94661497 = 94661497 × (80400521)
+ 94661497 × 1 yielding 94661497
+ 94661497 × 20 producing 1893229940
+ 94661497 × 500 resulting in 47330748500
+ 94661497 × 0000 that is equal 0
+ 94661497 × 00000 resulting in 0
+ 94661497 × 400000 which equals 37864598800000
+ 94661497 × 0000000 yielding 0
+ 94661497 × 80000000 that is equal 7572919760000000

= 7610833677439937
