Well, there's always the floating point type, float. I'm not exactly sure what the maximum value a float can have but it's somewhere between 1x10^300 and 1x10^400 (it's implimentation dependent.) Of course, this doesn't give you same granularity as integers, but it will hold larger numbers. Also, floating point operations are significantly more CPU intensive. Finally, the driver you are using has to have floating point support compiled in.
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