256712262633191 has 4 divisors (see below), whose sum is σ = 258984052568112. Its totient is φ = 254440472698272.

The previous prime is 256712262633187. The next prime is 256712262633199. The reversal of 256712262633191 is 191336262217652.

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

It is a cyclic number.

It is not a de Polignac number, because 256712262633191 - 2² = 256712262633187 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 (256712262633199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135894967291 + ... + 1135894967516.

It is an arithmetic number, because the mean of its divisors is an integer number (64746013142028).

Almost surely, 2^{256712262633191} is an apocalyptic number.

256712262633191 is a deficient number, since it is larger than the sum of its proper divisors (2271789934921).

256712262633191 is a wasteful number, since it uses less digits than its factorization.

256712262633191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271789934920.

The product of its digits is 9797760, while the sum is 56.

The spelling of 256712262633191 in words is "two hundred fifty-six trillion, seven hundred twelve billion, two hundred sixty-two million, six hundred thirty-three thousand, one hundred ninety-one".