256744412134615 has 4 divisors (see below), whose sum is σ = 308093294561544. Its totient is φ = 205395529707688.

The previous prime is 256744412134577. The next prime is 256744412134649. The reversal of 256744412134615 is 516431214447652.

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 256744412134615 - 2¹¹ = 256744412132567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25674441213457 + ... + 25674441213466.

It is an arithmetic number, because the mean of its divisors is an integer number (77023323640386).

Almost surely, 2^{256744412134615} is an apocalyptic number.

256744412134615 is a deficient number, since it is larger than the sum of its proper divisors (51348882426929).

256744412134615 is an equidigital number, since it uses as much as digits as its factorization.

256744412134615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51348882426928.

The product of its digits is 19353600, while the sum is 55.

The spelling of 256744412134615 in words is "two hundred fifty-six trillion, seven hundred forty-four billion, four hundred twelve million, one hundred thirty-four thousand, six hundred fifteen".