265 (two hundred [and] sixty-five) is the natural number following 264 and preceding 266.

In mathematics

• 265 is an odd composite number with two prime factors. ^[1]
• 265's sum of its proper divisors is 59. ^[2]
• 265 is the number of derangements possible with 6 digits. That means that it is equivalent to !6. ^[3]
• The number 265 is associated with the geometric shape known as the Vesica Piscis. This is shown by having 2 circles overlap in a way that the circumference of each circle touches the center of the other. Archimedes estimated that the ratio of the height of this shape to the width was 265:153 or approximately √3. ^[4]
• 265 is the 22nd Padovan number which is defined by the two equations P(0)=P(1)=P(2)=1 and P(n)=P(n-2)+P(n-3) similar to the Fibonacci sequence. ^[5]
• 265 is the 7th number to be the hypotenuse for two separate Pythagorean Triples. The other two values would be 23 and 264 or 96 and 247. ^[6]
• 265 is the sum of two sets of two perfect squares. Those being 11 and 12 or 16 and 3.
• 265 is palindromic in base 12 (1A1).

References