665884 has 6 divisors (see below), whose sum is σ = 1165304. Its totient is φ = 332940.

The previous prime is 665857. The next prime is 665897. The reversal of 665884 is 488566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83232 + ... + 83239.

2⁶⁶⁵⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

665884 is a deficient number, since it is larger than the sum of its proper divisors (499420).

665884 is a wasteful number, since it uses less digits than its factorization.

665884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166475 (or 166473 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 665884 is about 816.0171566824. The cubic root of 665884 is about 87.3238469712.

The spelling of 665884 in words is "six hundred sixty-five thousand, eight hundred eighty-four".