Alright, let's work through 83873787 times 65794149 step by step
83873787 × 65794149 = 65794149 × (83873787)
+ 65794149 × 7 yielding 460559043
+ 65794149 × 80 giving us 5263531920
+ 65794149 × 700 that results in 46055904300
+ 65794149 × 3000 that is equal 197382447000
+ 65794149 × 70000 that results in 4605590430000
+ 65794149 × 800000 producing 52635319200000
+ 65794149 × 3000000 yielding 197382447000000
+ 65794149 × 80000000 that is equal 5263531920000000

= 5518404439072263
