256789566553 has 8 divisors (see below), whose sum is σ = 282426496128. Its totient is φ = 231993192144.

The previous prime is 256789566529. The next prime is 256789566571. The reversal of 256789566553 is 355665987652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256789566553 - 2⁵ = 256789566521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256789566853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210138151 + ... + 210139372.

It is an arithmetic number, because the mean of its divisors is an integer number (35303312016).

Almost surely, 2^256789566553 is an apocalyptic number.

It is an amenable number.

256789566553 is a deficient number, since it is larger than the sum of its proper divisors (25636929575).

256789566553 is a wasteful number, since it uses less digits than its factorization.

256789566553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420277583.

The product of its digits is 408240000, while the sum is 67.

The spelling of 256789566553 in words is "two hundred fifty-six billion, seven hundred eighty-nine million, five hundred sixty-six thousand, five hundred fifty-three".