666502 has 8 divisors (see below), whose sum is σ = 1058616. Its totient is φ = 313632.

The previous prime is 666493. The next prime is 666511. The reversal of 666502 is 205666.

It is an interprime number because it is at equal distance from previous prime (666493) and next prime (666511).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

666502 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9768 + ... + 9835.

It is an arithmetic number, because the mean of its divisors is an integer number (132327).

2⁶⁶⁶⁵⁰² is an apocalyptic number.

666502 is a deficient number, since it is larger than the sum of its proper divisors (392114).

666502 is a wasteful number, since it uses less digits than its factorization.

666502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19622.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 666502 is about 816.3957373725. The cubic root of 666502 is about 87.3508534022.

The spelling of 666502 in words is "six hundred sixty-six thousand, five hundred two".