0 (zero is a digit), but if you want a nonzero number, then 1, or if you're counting negatives as 'smaller' than positives (they are less than, not really smaller, though), then -9 would be it.
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One
The smallest three digit number is 0.01. One less than that would be -1.01.
Take the smallest 6-digit even number, then subtract one from it.
1111
1