256696598593 has 4 divisors (see below), whose sum is σ = 256724082688. Its totient is φ = 256669114500.

The previous prime is 256696598573. The next prime is 256696598629. The reversal of 256696598593 is 395895696652.

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 a de Polignac number, because none of the positive numbers 2^k-256696598593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256696598573) 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, 13728033 + ... + 13746718.

It is an arithmetic number, because the mean of its divisors is an integer number (64181020672).

Almost surely, 2^256696598593 is an apocalyptic number.

It is an amenable number.

256696598593 is a deficient number, since it is larger than the sum of its proper divisors (27484095).

256696598593 is an equidigital number, since it uses as much as digits as its factorization.

256696598593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27484094.

The product of its digits is 944784000, while the sum is 73.

The spelling of 256696598593 in words is "two hundred fifty-six billion, six hundred ninety-six million, five hundred ninety-eight thousand, five hundred ninety-three".