Alright, let's work through 51801056 times 13579647 step by step
51801056 × 13579647 = 13579647 × (51801056)
+ 13579647 × 6 what gives us 81477882
+ 13579647 × 50 that is equal 678982350
+ 13579647 × 000 what gives us 0
+ 13579647 × 1000 producing 13579647000
+ 13579647 × 00000 that equals 0
+ 13579647 × 800000 producing 10863717600000
+ 13579647 × 1000000 what gives us 13579647000000
+ 13579647 × 50000000 that equals 678982350000000

= 703440054707232
