256121618 has 8 divisors (see below), whose sum is σ = 384825600. Its totient is φ = 127846420.

The previous prime is 256121611. The next prime is 256121627. The reversal of 256121618 is 816121652.

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

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

It is not an unprimeable number, because it can be changed into a prime (256121611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105698 + ... + 108093.

It is an arithmetic number, because the mean of its divisors is an integer number (48103200).

Almost surely, 2^256121618 is an apocalyptic number.

256121618 is a deficient number, since it is larger than the sum of its proper divisors (128703982).

256121618 is a wasteful number, since it uses less digits than its factorization.

256121618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214392.

The product of its digits is 5760, while the sum is 32.

The square root of 256121618 is about 16003.8001112236. The cubic root of 256121618 is about 635.0609551505.

The spelling of 256121618 in words is "two hundred fifty-six million, one hundred twenty-one thousand, six hundred eighteen".