665204 has 6 divisors (see below), whose sum is σ = 1164114. Its totient is φ = 332600.

The previous prime is 665201. The next prime is 665207. The reversal of 665204 is 402566.

It is an interprime number because it is at equal distance from previous prime (665201) and next prime (665207).

It can be written as a sum of positive squares in only one way, i.e., 425104 + 240100 = 652^2 + 490^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 665204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83147 + ... + 83154.

It is an arithmetic number, because the mean of its divisors is an integer number (194019).

2⁶⁶⁵²⁰⁴ is an apocalyptic number.

It is an amenable number.

665204 is a deficient number, since it is larger than the sum of its proper divisors (498910).

665204 is a wasteful number, since it uses less digits than its factorization.

665204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166305 (or 166303 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 665204 is about 815.6003923491. The cubic root of 665204 is about 87.2941118420.

The spelling of 665204 in words is "six hundred sixty-five thousand, two hundred four".