665902 has 4 divisors (see below), whose sum is σ = 998856. Its totient is φ = 332950.

The previous prime is 665897. The next prime is 665921. The reversal of 665902 is 209566.

It is a semiprime because it is the product of two primes.

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, 166474 + ... + 166477.

It is an arithmetic number, because the mean of its divisors is an integer number (249714).

2⁶⁶⁵⁹⁰² is an apocalyptic number.

665902 is a deficient number, since it is larger than the sum of its proper divisors (332954).

665902 is a wasteful number, since it uses less digits than its factorization.

665902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332953.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 665902 is about 816.0281857877. The cubic root of 665902 is about 87.3246338025.

The spelling of 665902 in words is "six hundred sixty-five thousand, nine hundred two".