256897247975 has 12 divisors (see below), whose sum is σ = 318740355264. Its totient is φ = 205396657920.

The previous prime is 256897247947. The next prime is 256897247977. The reversal of 256897247975 is 579742798652.

It is a de Polignac number, because none of the positive numbers 2^k-256897247975 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256897247899 and 256897247908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256897247977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2985239 + ... + 3070088.

It is an arithmetic number, because the mean of its divisors is an integer number (26561696272).

Almost surely, 2^256897247975 is an apocalyptic number.

256897247975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256897247975 is a deficient number, since it is larger than the sum of its proper divisors (61843107289).

256897247975 is a wasteful number, since it uses less digits than its factorization.

256897247975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6057034 (or 6057029 counting only the distinct ones).

The product of its digits is 533433600, while the sum is 71.

The spelling of 256897247975 in words is "two hundred fifty-six billion, eight hundred ninety-seven million, two hundred forty-seven thousand, nine hundred seventy-five".