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As of 2015, the longest prime number known ends in 1.
the answer is infinite.
The longest number that would also be the smallest would be the highest number counted to just made into its negative form.
Well, it depends on if you're talking about the tallest number, or the longest number. I think the tallest number was a "3", and the longest number was an "8". (pp 94)
It is number One in European rivers, the longest, widest,most used.
There is no record for the longest game, only the largest (by number of mats and number of players).
the longest number is 2
65
The longest factor string of any composite number is its prime factorization.
the number 9 with a never ending list of nines after it.
51
The prime factorization.