256526040423 has 4 divisors (see below), whose sum is σ = 342034720568. Its totient is φ = 171017360280.

The previous prime is 256526040401. The next prime is 256526040443. The reversal of 256526040423 is 324040625652.

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

It is not a de Polignac number, because 256526040423 - 2¹⁸ = 256525778279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256526040443) 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, 42754340068 + ... + 42754340073.

It is an arithmetic number, because the mean of its divisors is an integer number (85508680142).

Almost surely, 2^256526040423 is an apocalyptic number.

256526040423 is a deficient number, since it is larger than the sum of its proper divisors (85508680145).

256526040423 is an equidigital number, since it uses as much as digits as its factorization.

256526040423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85508680144.

The product of its (nonzero) digits is 345600, while the sum is 39.

The spelling of 256526040423 in words is "two hundred fifty-six billion, five hundred twenty-six million, forty thousand, four hundred twenty-three".