The numberical system is an on going one, meaning it never stops. You could spend your entire life counting (though I advise you not to do so). The longest number a man has ever counted to was 1,256,859,636...
So really, when someone asks this question, the correct answer is enfinity, or
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Infinity.
The greatest possible number is 888... (repeating).
15499
40
8 is the greatest possible whole number remainder, eg seventeen divided by nine...