256164213533 has 16 divisors (see below), whose sum is σ = 272207827584. Its totient is φ = 240229486080.

The previous prime is 256164213521. The next prime is 256164213553. The reversal of 256164213533 is 335312461652.

It is not a de Polignac number, because 256164213533 - 2⁴ = 256164213517 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256164213553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20248616 + ... + 20261262.

It is an arithmetic number, because the mean of its divisors is an integer number (17012989224).

Almost surely, 2^256164213533 is an apocalyptic number.

It is an amenable number.

256164213533 is a deficient number, since it is larger than the sum of its proper divisors (16043614051).

256164213533 is a wasteful number, since it uses less digits than its factorization.

256164213533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16852.

The product of its digits is 388800, while the sum is 41.

The spelling of 256164213533 in words is "two hundred fifty-six billion, one hundred sixty-four million, two hundred thirteen thousand, five hundred thirty-three".