No problem, we've got 1605 and 1611 to multiply
1605 × 1611 = 1611 × (1605)
+ 1611 × 5 what gives us 8055
+ 1611 × 00 yielding 0
+ 1611 × 600 giving us 966600
+ 1611 × 1000 that is equal 1611000

= 2585655
