666004 has 24 divisors (see below), whose sum is σ = 1241856. Its totient is φ = 312000.

The previous prime is 665993. The next prime is 666013. The reversal of 666004 is 400666.

It is a super-2 number, since 2×666004² = 887122656032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5019 + ... + 5149.

It is an arithmetic number, because the mean of its divisors is an integer number (51744).

2⁶⁶⁶⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

666004 is a deficient number, since it is larger than the sum of its proper divisors (575852).

666004 is a wasteful number, since it uses less digits than its factorization.

666004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 666004 is about 816.0906812359. The cubic root of 666004 is about 87.3290922453.

The spelling of 666004 in words is "six hundred sixty-six thousand, four".