256252666207 has 4 divisors (see below), whose sum is σ = 257273593416. Its totient is φ = 255231739000.

The previous prime is 256252666193. The next prime is 256252666291. The reversal of 256252666207 is 702666252652.

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-256252666207 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256252666297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510463228 + ... + 510463729.

It is an arithmetic number, because the mean of its divisors is an integer number (64318398354).

Almost surely, 2^256252666207 is an apocalyptic number.

256252666207 is a deficient number, since it is larger than the sum of its proper divisors (1020927209).

256252666207 is a wasteful number, since it uses less digits than its factorization.

256252666207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020927208.

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 256252666207 in words is "two hundred fifty-six billion, two hundred fifty-two million, six hundred sixty-six thousand, two hundred seven".