256712262633247 has 4 divisors (see below), whose sum is σ = 256712594250816. Its totient is φ = 256711931015680.

The previous prime is 256712262633221. The next prime is 256712262633263. The reversal of 256712262633247 is 742336262217652.

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 256712262633247 - 2³¹ = 256710115149599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256712262633191 and 256712262633200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256712262633847) 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, 164644879 + ... + 166196752.

It is an arithmetic number, because the mean of its divisors is an integer number (64178148562704).

Almost surely, 2^{256712262633247} is an apocalyptic number.

256712262633247 is a deficient number, since it is larger than the sum of its proper divisors (331617569).

256712262633247 is an equidigital number, since it uses as much as digits as its factorization.

256712262633247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331617568.

The product of its digits is 60963840, while the sum is 58.

The spelling of 256712262633247 in words is "two hundred fifty-six trillion, seven hundred twelve billion, two hundred sixty-two million, six hundred thirty-three thousand, two hundred forty-seven".