256516540756247 has 4 divisors (see below), whose sum is σ = 260030465972160. Its totient is φ = 253002615540336.

The previous prime is 256516540756241. The next prime is 256516540756253. The reversal of 256516540756247 is 742657045615652.

256516540756247 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 is an interprime number because it is at equal distance from previous prime (256516540756241) and next prime (256516540756253).

It is a cyclic number.

It is not a de Polignac number, because 256516540756247 - 2⁶ = 256516540756183 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 (256516540756241) 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, 1756962607847 + ... + 1756962607992.

It is an arithmetic number, because the mean of its divisors is an integer number (65007616493040).

Almost surely, 2^{256516540756247} is an apocalyptic number.

256516540756247 is a deficient number, since it is larger than the sum of its proper divisors (3513925215913).

256516540756247 is an equidigital number, since it uses as much as digits as its factorization.

256516540756247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513925215912.

The product of its (nonzero) digits is 423360000, while the sum is 65.

The spelling of 256516540756247 in words is "two hundred fifty-six trillion, five hundred sixteen billion, five hundred forty million, seven hundred fifty-six thousand, two hundred forty-seven".