256231288380717 has 24 divisors (see below), whose sum is σ = 398751110221464. Its totient is φ = 157613893743744.

The previous prime is 256231288380707. The next prime is 256231288380719. The reversal of 256231288380717 is 717083882132652.

It is a happy number.

256231288380717 is a `hidden beast` number, since 2 + 5 + 6 + 231 + 2 + 8 + 8 + 380 + 7 + 17 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14275316636361 + 241955971744356 = 3778269^2 + 15554934^2 .

It is not a de Polignac number, because 256231288380717 - 2²⁴ = 256231271603501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256231288380719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464300178 + ... + 464851715.

It is an arithmetic number, because the mean of its divisors is an integer number (16614629592561).

Almost surely, 2^{256231288380717} is an apocalyptic number.

It is an amenable number.

256231288380717 is a deficient number, since it is larger than the sum of its proper divisors (142519821840747).

256231288380717 is a wasteful number, since it uses less digits than its factorization.

256231288380717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929154269 (or 929154266 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 63.

The spelling of 256231288380717 in words is "two hundred fifty-six trillion, two hundred thirty-one billion, two hundred eighty-eight million, three hundred eighty thousand, seven hundred seventeen".