256967966 has 4 divisors (see below), whose sum is σ = 385451952. Its totient is φ = 128483982.

The previous prime is 256967947. The next prime is 256968013. The reversal of 256967966 is 669769652.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64241990 + ... + 64241993.

It is an arithmetic number, because the mean of its divisors is an integer number (96362988).

Almost surely, 2^256967966 is an apocalyptic number.

256967966 is a deficient number, since it is larger than the sum of its proper divisors (128483986).

256967966 is a wasteful number, since it uses less digits than its factorization.

256967966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128483985.

The product of its digits is 7348320, while the sum is 56.

The square root of 256967966 is about 16030.2203977363. The cubic root of 256967966 is about 635.7597008284.

The spelling of 256967966 in words is "two hundred fifty-six million, nine hundred sixty-seven thousand, nine hundred sixty-six".