Alright, let's work through 86063369 times 16007977 step by step
86063369 × 16007977 = 16007977 × (86063369)
+ 16007977 × 9 resulting in 144071793
+ 16007977 × 60 that is equal 960478620
+ 16007977 × 300 which equals 4802393100
+ 16007977 × 3000 which equals 48023931000
+ 16007977 × 60000 producing 960478620000
+ 16007977 × 000000 yielding 0
+ 16007977 × 6000000 that is equal 96047862000000
+ 16007977 × 80000000 what gives us 1280638160000000

= 1377700431494513
