256536421153 has 4 divisors (see below), whose sum is σ = 256875307540. Its totient is φ = 256197534768.

The previous prime is 256536421151. The next prime is 256536421159. The reversal of 256536421153 is 351124635652.

256536421153 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 189339857424 + 67196563729 = 435132^2 + 259223^2 .

It is a cyclic number.

It is not a de Polignac number, because 256536421153 - 2¹ = 256536421151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256536421151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169442058 + ... + 169443571.

It is an arithmetic number, because the mean of its divisors is an integer number (64218826885).

Almost surely, 2^256536421153 is an apocalyptic number.

It is an amenable number.

256536421153 is a deficient number, since it is larger than the sum of its proper divisors (338886387).

256536421153 is an equidigital number, since it uses as much as digits as its factorization.

256536421153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338886386.

The product of its digits is 648000, while the sum is 43.

The spelling of 256536421153 in words is "two hundred fifty-six billion, five hundred thirty-six million, four hundred twenty-one thousand, one hundred fifty-three".