My information is that it is decillion defined as 10 to the power 60; ie 60 zeros to the right of the 1 number.
This is not necessary. A centillion is 10 to the power of 343. This is clearly larger than 1 decillion.
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"Zetta" is the prefix with the largest value. It represents 10^21 or 1,000,000,000,000,000,000,000.
There is no largest. The largest common prefix is yotta- which is equal to a septillion. But there is no reason why you cannot use a thousand yottagrams or a million yottametres.
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.
The world coin that has the largest ratio of size per monetary value is the Canadian mint $1,000,000 coin. The Canadian mint $1,000,000 coin weighs 100 kilograms.
The prefix for "outer" is "out-".
Officially approved by the SI, no. Actually if you want such a large number, you can just as well use the base unit, and scientific notation. For example, instead of "3.2 Petahertz", you might just as well talk about 3.2 x 1015 hertz.