664055 has 8 divisors (see below), whose sum is σ = 910752. Its totient is φ = 455328.

The previous prime is 664043. The next prime is 664061. The reversal of 664055 is 550466.

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 664055 - 2⁶ = 663991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9452 + ... + 9521.

It is an arithmetic number, because the mean of its divisors is an integer number (113844).

2⁶⁶⁴⁰⁵⁵ is an apocalyptic number.

664055 is a deficient number, since it is larger than the sum of its proper divisors (246697).

664055 is a wasteful number, since it uses less digits than its factorization.

664055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18985.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 664055 is about 814.8956988474. The cubic root of 664055 is about 87.2438221366.

The spelling of 664055 in words is "six hundred sixty-four thousand, fifty-five".