No problem, we've got 8147 and 1665 to multiply
8147 × 1665 = 1665 × (8147)
+ 1665 × 7 which equals 11655
+ 1665 × 40 what gives us 66600
+ 1665 × 100 which equals 166500
+ 1665 × 8000 that equals 13320000

= 13564755
