256500013 has 8 divisors (see below), whose sum is σ = 319792320. Its totient is φ = 199870080.

The previous prime is 256500011. The next prime is 256500043. The reversal of 256500013 is 310005652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256500013 - 2¹ = 256500011 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 (256500011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1665508 + ... + 1665661.

It is an arithmetic number, because the mean of its divisors is an integer number (39974040).

Almost surely, 2^256500013 is an apocalyptic number.

It is an amenable number.

256500013 is a deficient number, since it is larger than the sum of its proper divisors (63292307).

256500013 is a wasteful number, since it uses less digits than its factorization.

256500013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331187.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 256500013 is about 16015.6177839008. The cubic root of 256500013 is about 635.3735483723.

Adding to 256500013 its reverse (310005652), we get a palindrome (566505665).

The spelling of 256500013 in words is "two hundred fifty-six million, five hundred thousand, thirteen".