Unless you're talking about the integers... in which case the answer is that 1 and -1 are equally close to zero... there's no such thing, not even if you limit yourself to only rational numbers.
There is a smallest possible positive value distinct from zero that can be represented in a computer, but what it is depends on the details of how the computer was constructed.
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0.2 is the closest that you will get. The nearest integer, though, is 0.
The closest value is the actual value, 5376. No other value can get closer.
The closest value is the actual value which is 85*25 = 2125. No other value can get closer.
It's closest to 0 because the value is far to the right of the decimal point. It is only a bit more than 0.001 from zero, but more than 0.449 from 0.5 (and therefore even farther from 1).
Divide it out, 5/6 = 0.8333, so its closest to 1