Alright, let's work through 55386763 times 15894157 step by step
55386763 × 15894157 = 15894157 × (55386763)
+ 15894157 × 3 what gives us 47682471
+ 15894157 × 60 what gives us 953649420
+ 15894157 × 700 that equals 11125909900
+ 15894157 × 6000 resulting in 95364942000
+ 15894157 × 80000 which equals 1271532560000
+ 15894157 × 300000 that equals 4768247100000
+ 15894157 × 5000000 producing 79470785000000
+ 15894157 × 50000000 yielding 794707850000000

= 880325906843791
