256723838027 has 4 divisors (see below), whose sum is σ = 256736878176. Its totient is φ = 256710797880.

The previous prime is 256723838011. The next prime is 256723838039. The reversal of 256723838027 is 720838327652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256723838027 - 2⁴ = 256723838011 is a prime.

It is a super-3 number, since 3×256723838027³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256723838027.

It is not an unprimeable number, because it can be changed into a prime (256723838047) 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 3 ways as a sum of consecutive naturals, for example, 6490499 + ... + 6529932.

It is an arithmetic number, because the mean of its divisors is an integer number (64184219544).

Almost surely, 2^256723838027 is an apocalyptic number.

256723838027 is a deficient number, since it is larger than the sum of its proper divisors (13040149).

256723838027 is a wasteful number, since it uses less digits than its factorization.

256723838027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13040148.

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 256723838027 in words is "two hundred fifty-six billion, seven hundred twenty-three million, eight hundred thirty-eight thousand, twenty-seven".