665223 has 16 divisors (see below), whose sum is σ = 983136. Its totient is φ = 397440.

The previous prime is 665221. The next prime is 665233. The reversal of 665223 is 322566.

It is not a de Polignac number, because 665223 - 2¹ = 665221 is a prime.

It is a super-3 number, since 3×665223³ = 883126718236333701, which contains 333 as substring.

It is a plaindrome in base 9 and base 14.

It is a junction number, because it is equal to n+sod(n) for n = 665193 and 665202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1213 + ... + 1673.

It is an arithmetic number, because the mean of its divisors is an integer number (61446).

2⁶⁶⁵²²³ is an apocalyptic number.

665223 is a deficient number, since it is larger than the sum of its proper divisors (317913).

665223 is a wasteful number, since it uses less digits than its factorization.

665223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514.

The product of its digits is 2160, while the sum is 24.

The square root of 665223 is about 815.6120401269. The cubic root of 665223 is about 87.2949429516.

Adding to 665223 its reverse (322566), we get a palindrome (987789).

It can be divided in two parts, 665 and 223, that added together give a palindrome (888).

The spelling of 665223 in words is "six hundred sixty-five thousand, two hundred twenty-three".