256506443245307 has 4 divisors (see below), whose sum is σ = 257281387182936. Its totient is φ = 255731499307680.

The previous prime is 256506443245207. The next prime is 256506443245309. The reversal of 256506443245307 is 703542344605652.

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 256506443245307 - 2¹⁴ = 256506443228923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256506443245309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387471968318 + ... + 387471968979.

It is an arithmetic number, because the mean of its divisors is an integer number (64320346795734).

Almost surely, 2^{256506443245307} is an apocalyptic number.

256506443245307 is a deficient number, since it is larger than the sum of its proper divisors (774943937629).

256506443245307 is an equidigital number, since it uses as much as digits as its factorization.

256506443245307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774943937628.

The product of its (nonzero) digits is 72576000, while the sum is 56.

The spelling of 256506443245307 in words is "two hundred fifty-six trillion, five hundred six billion, four hundred forty-three million, two hundred forty-five thousand, three hundred seven".