The greatest possible number is 888... (repeating).
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All numbers are made with digits and there is no limit on how big they can be. So there is no greatest number.
§ In comparing two whole numbers, the one with the most digits is always the greater number. § In decimals the number with the greatest number of digits is not always the greatest.
-5
7642
If you're talking about whole numbers, then it's 6,049 .If you're talking about any number, including decimals and fractions, then there's no "greatest possible" one.