Number Gossip

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Unique Properties of 66

  • 66 is the lowest non-strobogrammatic number that shares a strobogrammatic prime factor with its invertible partner, i.e., 66 and 99 are both divisible by 11
  • In Star Wars, Order 66 is a prepared order to the clone troopers to kill the Jedi commanding them
  • 66 is the smallest abundant palindrome
  • 66 is the number of triangular polyominoes with 8 cells
  • 66 is the smallest palindrome which is a product of three distinct primes (submitted by Massimo Kofler)
  • 66 is the smallest triangular number which is a product of three primes

Common Properties of 66

Abundant
Composite
Even
Evil
Palindrome
Practical
Square-free
Triangular