256568317560 has 64 divisors (see below), whose sum is σ = 855227728800. Its totient is φ = 68418217728.

The previous prime is 256568317513. The next prime is 256568317583. The reversal of 256568317560 is 65713865652.

It is a happy number.

256568317560 is a `hidden beast` number, since 2 + 5 + 6 + 5 + 68 + 3 + 17 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 256568317497 and 256568317506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118780549 + ... + 118782708.

Almost surely, 2^256568317560 is an apocalyptic number.

256568317560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256568317560 is an abundant number, since it is smaller than the sum of its proper divisors (598659411240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256568317560 is a wasteful number, since it uses less digits than its factorization.

256568317560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237563277 (or 237563267 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 54.

The spelling of 256568317560 in words is "two hundred fifty-six billion, five hundred sixty-eight million, three hundred seventeen thousand, five hundred sixty".