It is 6543. Actually a bigger odd number which can be made from these digits is 5^643 which is 450 digits in length.
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Well, honey, the biggest odd number you can make with 4536 is 4535. Just take that even number and subtract 1, and voila! You've got yourself the biggest odd number possible. Math can be a real hoot sometimes, can't it?
That's just as meaningless a question as asking "what is the biggest number?" Just as there is no biggest number (you can always get bigger numbers by adding 1), there is no odd number with the most factors. You could multiply any odd number by 3, and get an odd number with another factor of 3.
87543001
Using those 4 digits 6451 is the largest odd number you can make.
Always an even number. Think of an odd number as an even number plus a half. Add them up and the two halves make an even.
27 is an odd number.