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No, zero is not the smallest single didget number. There negative single digit number from -1 through -9
It requires one character to write it.
2 Answer: Without getting into the whole is zero a number or not debate, any of the numbers 0 to 9. (If you consider zero to be not a number then it's 1 to 9).
81 is.
6 is the only single digit perfect number.