256683315076439 has 4 divisors (see below), whose sum is σ = 257000599768320. Its totient is φ = 256366030384560.

The previous prime is 256683315076421. The next prime is 256683315076541. The reversal of 256683315076439 is 934670513386652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256683315076439 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 (256683315070439) 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, 158642344727 + ... + 158642346344.

It is an arithmetic number, because the mean of its divisors is an integer number (64250149942080).

It is a 1-persistent number, because it is pandigital, but 2⋅256683315076439 = 513366630152878 is not.

Almost surely, 2^{256683315076439} is an apocalyptic number.

256683315076439 is a deficient number, since it is larger than the sum of its proper divisors (317284691881).

256683315076439 is an equidigital number, since it uses as much as digits as its factorization.

256683315076439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317284691880.

The product of its (nonzero) digits is 587865600, while the sum is 68.

The spelling of 256683315076439 in words is "two hundred fifty-six trillion, six hundred eighty-three billion, three hundred fifteen million, seventy-six thousand, four hundred thirty-nine".