664655 has 8 divisors (see below), whose sum is σ = 802032. Its totient is φ = 528768.

The previous prime is 664633. The next prime is 664661. The reversal of 664655 is 556466.

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

It is a cyclic number.

It is not a de Polignac number, because 664655 - 2¹⁰ = 663631 is a prime.

It is a Duffinian number.

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, 1319 + ... + 1751.

It is an arithmetic number, because the mean of its divisors is an integer number (100254).

2⁶⁶⁴⁶⁵⁵ is an apocalyptic number.

664655 is a deficient number, since it is larger than the sum of its proper divisors (137377).

664655 is a wasteful number, since it uses less digits than its factorization.

664655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745.

The product of its digits is 21600, while the sum is 32.

The square root of 664655 is about 815.2637610001. The cubic root of 664655 is about 87.2700903099.

The spelling of 664655 in words is "six hundred sixty-four thousand, six hundred fifty-five".