256313543613 has 4 divisors (see below), whose sum is σ = 341751391488. Its totient is φ = 170875695740.

The previous prime is 256313543611. The next prime is 256313543639. The reversal of 256313543613 is 316345313652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256313543613 - 2¹ = 256313543611 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256313543611) 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, 42718923933 + ... + 42718923938.

It is an arithmetic number, because the mean of its divisors is an integer number (85437847872).

Almost surely, 2^256313543613 is an apocalyptic number.

It is an amenable number.

256313543613 is a deficient number, since it is larger than the sum of its proper divisors (85437847875).

256313543613 is an equidigital number, since it uses as much as digits as its factorization.

256313543613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85437847874.

The product of its digits is 583200, while the sum is 42.

The spelling of 256313543613 in words is "two hundred fifty-six billion, three hundred thirteen million, five hundred forty-three thousand, six hundred thirteen".