256372173653 has 16 divisors (see below), whose sum is σ = 266322228480. Its totient is φ = 246645192000.

The previous prime is 256372173611. The next prime is 256372173709. The reversal of 256372173653 is 356371273652.

It is a cyclic number.

It is not a de Polignac number, because 256372173653 - 2⁸ = 256372173397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256372173053) by changing a digit.

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, 465563 + ... + 854103.

It is an arithmetic number, because the mean of its divisors is an integer number (16645139280).

Almost surely, 2^256372173653 is an apocalyptic number.

It is an amenable number.

256372173653 is a deficient number, since it is larger than the sum of its proper divisors (9950054827).

256372173653 is a wasteful number, since it uses less digits than its factorization.

256372173653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388828.

The product of its digits is 4762800, while the sum is 50.

Subtracting 256372173653 from its reverse (356371273652), we obtain a palindrome (99999099999).

The spelling of 256372173653 in words is "two hundred fifty-six billion, three hundred seventy-two million, one hundred seventy-three thousand, six hundred fifty-three".