There is not much world renowned significance to the number 263. It is, however, an irregular Prime number. This number may have some significance personally to some people.
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I have two: "1" and "263".
no...
263 is an integer, not a fraction nor a mixed number.
If you add 419 to 263 the answer is 682 and the Roman numeral for this number is DCLXXXII 420 + 260 = 680
Yes by itself and one because 263 is a prime number that has only two factors.