yeh, 2147483647 also.
what does the maximum rep value even mean, exactly - receiving the maximum amount of points from others' good reps, or to do with giving out reps myself? does the total draw from a particular period of time or ever since the MTF join date....?
Your rep points has nothing directly to do with what you give, only what you receive (indirectly giving helps, if you get reps in return, since then the people giving to you will have more to give).
The total undoubtedly draws from the MTF join date. Back when the system was started, I doubt anyone thought about maximum values. In fact, I know from asking a veteran that back then the dots were even in play - not as now, when most newcomers go straight from one to ten green dots on their first rep. But it turned out that after a few years points accumulated and became big numbers indeed.