66217 has 4 divisors (see below), whose sum is σ = 69120. Its totient is φ = 63316.

The previous prime is 66191. The next prime is 66221. The reversal of 66217 is 71266.

66217 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66217 - 2⁷ = 66089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417 + ... + 1462.

It is an arithmetic number, because the mean of its divisors is an integer number (17280).

2⁶⁶²¹⁷ is an apocalyptic number.

It is an amenable number.

66217 is a deficient number, since it is larger than the sum of its proper divisors (2903).

66217 is a wasteful number, since it uses less digits than its factorization.

66217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902.

The product of its digits is 504, while the sum is 22.

The square root of 66217 is about 257.3266406729. The cubic root of 66217 is about 40.4566421121.

The spelling of 66217 in words is "sixty-six thousand, two hundred seventeen".