Alright, let's work through 1661 times 9881 step by step
1661 × 9881 = 9881 × (1661)
+ 9881 × 1 that equals 9881
+ 9881 × 60 that equals 592860
+ 9881 × 600 resulting in 5928600
+ 9881 × 1000 that equals 9881000

= 16412341
