Number Gossip

(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)

Unique Properties of 65

  • 65 is the smallest number that becomes square if its reverse is either added to or subtracted from it
  • 65 is the smallest composite number of the form n2 + 1, where n is even
  • 65 is the magic constant of the 5 by 5 magic square
  • 65 is the smallest hypotenuse of two different primitive Pythagorean triangles (33, 56, 65 and 16, 63, 65)

Common Properties of 65

Composite
Deficient
Evil
Odd
Square-free