256507244516747 has 4 divisors (see below), whose sum is σ = 293151136590576. Its totient is φ = 219863352442920.

The previous prime is 256507244516687. The next prime is 256507244516813. The reversal of 256507244516747 is 747615442705652.

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 256507244516747 - 2⁴⁶ = 186138500339083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256507244516947) 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, 18321946036904 + ... + 18321946036917.

It is an arithmetic number, because the mean of its divisors is an integer number (73287784147644).

Almost surely, 2^{256507244516747} is an apocalyptic number.

256507244516747 is a deficient number, since it is larger than the sum of its proper divisors (36643892073829).

256507244516747 is an equidigital number, since it uses as much as digits as its factorization.

256507244516747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36643892073828.

The product of its (nonzero) digits is 395136000, while the sum is 65.

The spelling of 256507244516747 in words is "two hundred fifty-six trillion, five hundred seven billion, two hundred forty-four million, five hundred sixteen thousand, seven hundred forty-seven".