256967657 has 4 divisors (see below), whose sum is σ = 257001600. Its totient is φ = 256933716.

The previous prime is 256967651. The next prime is 256967663. The reversal of 256967657 is 756769652.

256967657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (256967651) and next prime (256967663).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256967657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256967599 and 256967608.

It is not an unprimeable number, because it can be changed into a prime (256967651) 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, 128 + ... + 22670.

It is an arithmetic number, because the mean of its divisors is an integer number (64250400).

Almost surely, 2^256967657 is an apocalyptic number.

It is an amenable number.

256967657 is a deficient number, since it is larger than the sum of its proper divisors (33943).

256967657 is a wasteful number, since it uses less digits than its factorization.

256967657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33942.

The product of its digits is 4762800, while the sum is 53.

The square root of 256967657 is about 16030.2107596875. The cubic root of 256967657 is about 635.7594459979.

The spelling of 256967657 in words is "two hundred fifty-six million, nine hundred sixty-seven thousand, six hundred fifty-seven".