256500427742045 has 4 divisors (see below), whose sum is σ = 307800513290460. Its totient is φ = 205200342193632.

The previous prime is 256500427741973. The next prime is 256500427742047. The reversal of 256500427742045 is 540247724005652.

256500427742045 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 127683965871289 + 128816461870756 = 11299733^2 + 11349734^2 .

It is a cyclic number.

It is not a de Polignac number, because 256500427742045 - 2³⁶ = 256431708265309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256500427742047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25650042774200 + ... + 25650042774209.

It is an arithmetic number, because the mean of its divisors is an integer number (76950128322615).

Almost surely, 2^{256500427742045} is an apocalyptic number.

It is an amenable number.

256500427742045 is a deficient number, since it is larger than the sum of its proper divisors (51300085548415).

256500427742045 is an equidigital number, since it uses as much as digits as its factorization.

256500427742045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51300085548414.

The product of its (nonzero) digits is 18816000, while the sum is 53.

The spelling of 256500427742045 in words is "two hundred fifty-six trillion, five hundred billion, four hundred twenty-seven million, seven hundred forty-two thousand, forty-five".