556685 has 4 divisors (see below), whose sum is σ = 668028. Its totient is φ = 445344.

The previous prime is 556679. The next prime is 556687. The reversal of 556685 is 586655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586655 = 5 ⋅117331.

It can be written as a sum of positive squares in 2 ways, for example, as 209764 + 346921 = 458^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 556685 - 2¹⁰ = 555661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556687) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 55664 + ... + 55673.

It is an arithmetic number, because the mean of its divisors is an integer number (167007).

2⁵⁵⁶⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

556685 is a deficient number, since it is larger than the sum of its proper divisors (111343).

556685 is a wasteful number, since it uses less digits than its factorization.

556685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111342.

The product of its digits is 36000, while the sum is 35.

The square root of 556685 is about 746.1132621794. The cubic root of 556685 is about 82.2627404253.

The spelling of 556685 in words is "five hundred fifty-six thousand, six hundred eighty-five".