Omni- is not an SI prefix, there is no omnimetre. The largest prefix is yotta- denoting septillion. 1 yottametre (1 Ym) is 1 000 000 000 000 000 000 000 000 metres, or 1 x 1024 metres.
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The prefix for million is mega-.
milli --
The metric prefix for billionth is nano- (symbol: n), representing 10^(-9).
The next metric prefix after nano in descending order is pico.
Centi is the metric prefix for one hundredth. It is abbreviated as "c" in the International System of Units (SI).