256706520607 has 4 divisors (see below), whose sum is σ = 258036606400. Its totient is φ = 255376434816.

The previous prime is 256706520601. The next prime is 256706520659. The reversal of 256706520607 is 706025607652.

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-256706520607 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 (256706520601) 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, 665042607 + ... + 665042992.

It is an arithmetic number, because the mean of its divisors is an integer number (64509151600).

Almost surely, 2^256706520607 is an apocalyptic number.

256706520607 is a deficient number, since it is larger than the sum of its proper divisors (1330085793).

256706520607 is a wasteful number, since it uses less digits than its factorization.

256706520607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330085792.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 256706520607 in words is "two hundred fifty-six billion, seven hundred six million, five hundred twenty thousand, six hundred seven".