256585618 has 4 divisors (see below), whose sum is σ = 384878430. Its totient is φ = 128292808.

The previous prime is 256585579. The next prime is 256585627. The reversal of 256585618 is 816585652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 221503689 + 35081929 = 14883^2 + 5923^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64146403 + ... + 64146406.

Almost surely, 2^256585618 is an apocalyptic number.

256585618 is a deficient number, since it is larger than the sum of its proper divisors (128292812).

256585618 is a wasteful number, since it uses less digits than its factorization.

256585618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128292811.

The product of its digits is 576000, while the sum is 46.

The square root of 256585618 is about 16018.2901084978. The cubic root of 256585618 is about 635.4442242658. Note that the first 3 decimals are identical.

The spelling of 256585618 in words is "two hundred fifty-six million, five hundred eighty-five thousand, six hundred eighteen".