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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