256510565250653 has 4 divisors (see below), whose sum is σ = 293154931715040. Its totient is φ = 219866198786268.

The previous prime is 256510565250631. The next prime is 256510565250703. The reversal of 256510565250653 is 356052565015652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256510565250653 - 2⁸ = 256510565250397 is a prime.

It is a super-3 number, since 3×256510565250653³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256510565252653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18322183232183 + ... + 18322183232196.

It is an arithmetic number, because the mean of its divisors is an integer number (73288732928760).

Almost surely, 2^{256510565250653} is an apocalyptic number.

It is an amenable number.

256510565250653 is a deficient number, since it is larger than the sum of its proper divisors (36644366464387).

256510565250653 is an equidigital number, since it uses as much as digits as its factorization.

256510565250653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36644366464386.

The product of its (nonzero) digits is 40500000, while the sum is 56.

The spelling of 256510565250653 in words is "two hundred fifty-six trillion, five hundred ten billion, five hundred sixty-five million, two hundred fifty thousand, six hundred fifty-three".