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The root is epony
1018
Exa is not a measurement unit. It is a prefix which means a quintillion or 10^18. So, for example,an exametre is a quintillion metres or approx 106 light years;the mass of the moon is approx 73 exatonsan exasecond is approx 32 billion years, or more than twice the age of the universe.
At least in Europe it would be Exa- (=1018) (http://en.wikipedia.org/wiki/SI_prefix)
After tera (10^12) comes peta, which is 10^15, followed by exa, which is 10^18.