256163018 has 4 divisors (see below), whose sum is σ = 384244530. Its totient is φ = 128081508.

The previous prime is 256163009. The next prime is 256163023. The reversal of 256163018 is 810361652.

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., 180176929 + 75986089 = 13423^2 + 8717^2 .

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, 64040753 + ... + 64040756.

Almost surely, 2^256163018 is an apocalyptic number.

256163018 is a deficient number, since it is larger than the sum of its proper divisors (128081512).

256163018 is a wasteful number, since it uses less digits than its factorization.

256163018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128081511.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 256163018 is about 16005.0935017575. The cubic root of 256163018 is about 635.0951708059.

The spelling of 256163018 in words is "two hundred fifty-six million, one hundred sixty-three thousand, eighteen".