Alright, let's work through 19781723 times 55643471 step by step
19781723 × 55643471 = 55643471 × (19781723)
+ 55643471 × 3 that is equal 166930413
+ 55643471 × 20 yielding 1112869420
+ 55643471 × 700 yielding 38950429700
+ 55643471 × 1000 resulting in 55643471000
+ 55643471 × 80000 giving us 4451477680000
+ 55643471 × 700000 that results in 38950429700000
+ 55643471 × 9000000 that results in 500791239000000
+ 55643471 × 10000000 yielding 556434710000000

= 1100723730080533
