Alright, let's work through 1666 times 9866 step by step
1666 × 9866 = 9866 × (1666)
+ 9866 × 6 resulting in 59196
+ 9866 × 60 yielding 591960
+ 9866 × 600 giving us 5919600
+ 9866 × 1000 yielding 9866000

= 16436756
