556645 has 8 divisors (see below), whose sum is σ = 673056. Its totient is φ = 441936.

The previous prime is 556639. The next prime is 556651. The reversal of 556645 is 546655.

556645 is nontrivially palindromic in base 15.

It is an interprime number because it is at equal distance from previous prime (556639) and next prime (556651).

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 556645 - 2⁵ = 556613 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, 474 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (84132).

2⁵⁵⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

556645 is a deficient number, since it is larger than the sum of its proper divisors (116411).

556645 is a wasteful number, since it uses less digits than its factorization.

556645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its digits is 18000, while the sum is 31.

The square root of 556645 is about 746.0864561162. The cubic root of 556645 is about 82.2607700780.

The spelling of 556645 in words is "five hundred fifty-six thousand, six hundred forty-five".