Alright, let's work through 84191873 times 64798159 step by step
84191873 × 64798159 = 64798159 × (84191873)
+ 64798159 × 3 that equals 194394477
+ 64798159 × 70 resulting in 4535871130
+ 64798159 × 800 that equals 51838527200
+ 64798159 × 1000 that results in 64798159000
+ 64798159 × 90000 which equals 5831834310000
+ 64798159 × 100000 producing 6479815900000
+ 64798159 × 4000000 giving us 259192636000000
+ 64798159 × 80000000 what gives us 5183852720000000

= 5455478373161807
