66604 has 6 divisors (see below), whose sum is σ = 116564. Its totient is φ = 33300.

The previous prime is 66601. The next prime is 66617. The reversal of 66604 is 40666.

It is not an unprimeable number, because it can be changed into a prime (66601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322 + ... + 8329.

2⁶⁶⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

66604 is a deficient number, since it is larger than the sum of its proper divisors (49960).

66604 is a wasteful number, since it uses less digits than its factorization.

66604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16655 (or 16653 counting only the distinct ones).

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

The square root of 66604 is about 258.0775077375. The cubic root of 66604 is about 40.5353042767.

The spelling of 66604 in words is "sixty-six thousand, six hundred four".