Writer's Block: Roll the dice

[hybz]

9.

Mostly due to how the digits of its multiplicants always sum up to nine.

18 (1+8=9) 27 (2+7=9) 36 (3+6=9) 123456789 (1+8+2+7+3+6+4+5+9=4+5=9)

3 is the same way, albiet more complicated.

12 (1+2=3) 63 (6+3=9/3=3)