66223 has 4 divisors (see below), whose sum is σ = 67680. Its totient is φ = 64768.

The previous prime is 66221. The next prime is 66239. The reversal of 66223 is 32266.

66223 = 12² + 13² + ... + 58².

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66223 - 2¹ = 66221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221) 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, 658 + ... + 751.

It is an arithmetic number, because the mean of its divisors is an integer number (16920).

2⁶⁶²²³ is an apocalyptic number.

66223 is a deficient number, since it is larger than the sum of its proper divisors (1457).

66223 is a wasteful number, since it uses less digits than its factorization.

66223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456.

The product of its digits is 432, while the sum is 19.

The square root of 66223 is about 257.3382987431. The cubic root of 66223 is about 40.4578640164.

Adding to 66223 its reverse (32266), we get a palindrome (98489).

It can be divided in two parts, 66 and 223, that added together give a square (289 = 17²).

The spelling of 66223 in words is "sixty-six thousand, two hundred twenty-three".