Alright, let's work through 6667 times 6441 step by step
6667 × 6441 = 6441 × (6667)
+ 6441 × 7 giving us 45087
+ 6441 × 60 that equals 386460
+ 6441 × 600 that is equal 3864600
+ 6441 × 6000 giving us 38646000

= 42942147
