Today is 25 day of the year.

25 = 5^2

25 is the smallest square that can be written as the sum of two squares.

25 is a member of two primitive, Pythagorean triples (7, 24, 25) and (25, 312, 313).

25 ends in the digit 5 which makes it an automorphic number.

25 has an Aliquot sum of 6 and 6, being perfect, has an Aliquot sum of 6 which makes 25 an Aspiring number.

25 is a lucky number.

25 is a Cullen number.

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