No problem, we've got 1664 and 6678 to multiply
1664 × 6678 = 6678 × (1664)
+ 6678 × 4 that results in 26712
+ 6678 × 60 which equals 400680
+ 6678 × 600 what gives us 4006800
+ 6678 × 1000 what gives us 6678000

= 11112192
