Alright, let's work through 1665 times 5072 step by step
1665 × 5072 = 5072 × (1665)
+ 5072 × 5 which equals 25360
+ 5072 × 60 which equals 304320
+ 5072 × 600 producing 3043200
+ 5072 × 1000 resulting in 5072000

= 8444880
