Alright, let's work through 4165 times 641 step by step
4165 × 641 = 641 × (4165)
+ 641 × 5 that equals 3205
+ 641 × 60 what gives us 38460
+ 641 × 100 yielding 64100
+ 641 × 4000 giving us 2564000

= 2669765
