Alright, let's work through 1664 times 8019 step by step
1664 × 8019 = 8019 × (1664)
+ 8019 × 4 which equals 32076
+ 8019 × 60 what gives us 481140
+ 8019 × 600 that is equal 4811400
+ 8019 × 1000 what gives us 8019000

= 13343616
