256345135213 has 4 divisors (see below), whose sum is σ = 256348538460. Its totient is φ = 256341731968.

The previous prime is 256345135187. The next prime is 256345135219. The reversal of 256345135213 is 312531543652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 208080120964 + 48265014249 = 456158^2 + 219693^2 .

It is a cyclic number.

It is not a de Polignac number, because 256345135213 - 2⁵ = 256345135181 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 (256345135219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1586020 + ... + 1740157.

It is an arithmetic number, because the mean of its divisors is an integer number (64087134615).

Almost surely, 2^256345135213 is an apocalyptic number.

It is an amenable number.

256345135213 is a deficient number, since it is larger than the sum of its proper divisors (3403247).

256345135213 is an equidigital number, since it uses as much as digits as its factorization.

256345135213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403246.

The product of its digits is 324000, while the sum is 40.

Adding to 256345135213 its reverse (312531543652), we get a palindrome (568876678865).

The spelling of 256345135213 in words is "two hundred fifty-six billion, three hundred forty-five million, one hundred thirty-five thousand, two hundred thirteen".