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If the number is even and the sum of its digits is divisible by nine then the number is divisible by 18.
987654321 is the highest nine-digit number with no repeated digits.
It is, but not evenly. You get a number with digits after the decimal point.
Add the digits of the number. If that total is divisible by nine, so is the original number. Example: 12,345,678 The digits total 36. 36 is divisible by 9. So is 12,345,678.
Nope - To be divisible by nine, the sum of the digits must also be divisible by 9 (the digits total 21). Additionally, since it's an odd number - it cannot be divided by 6 !