256968518 has 4 divisors (see below), whose sum is σ = 385452780. Its totient is φ = 128484258.

The previous prime is 256968511. The next prime is 256968527. The reversal of 256968518 is 815869652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256968511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64242128 + ... + 64242131.

It is an arithmetic number, because the mean of its divisors is an integer number (96363195).

Almost surely, 2^256968518 is an apocalyptic number.

256968518 is a deficient number, since it is larger than the sum of its proper divisors (128484262).

256968518 is a wasteful number, since it uses less digits than its factorization.

256968518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128484261.

The product of its digits is 1036800, while the sum is 50.

The square root of 256968518 is about 16030.2376152071. The cubic root of 256968518 is about 635.7601560591.

The spelling of 256968518 in words is "two hundred fifty-six million, nine hundred sixty-eight thousand, five hundred eighteen".