256168689 has 8 divisors (see below), whose sum is σ = 390352320. Its totient is φ = 146382096.

The previous prime is 256168667. The next prime is 256168691. The reversal of 256168689 is 986861652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256168689 - 2⁵ = 256168657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256168489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6099234 + ... + 6099275.

It is an arithmetic number, because the mean of its divisors is an integer number (48794040).

Almost surely, 2^256168689 is an apocalyptic number.

It is an amenable number.

256168689 is a deficient number, since it is larger than the sum of its proper divisors (134183631).

256168689 is a wasteful number, since it uses less digits than its factorization.

256168689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12198519.

The product of its digits is 1244160, while the sum is 51.

The square root of 256168689 is about 16005.2706631284. The cubic root of 256168689 is about 635.0998574024.

The spelling of 256168689 in words is "two hundred fifty-six million, one hundred sixty-eight thousand, six hundred eighty-nine".