256664545 has 8 divisors (see below), whose sum is σ = 308101824. Its totient is φ = 205262064.

The previous prime is 256664543. The next prime is 256664561. The reversal of 256664545 is 545466652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256664545 - 2¹ = 256664543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256664543) 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, 12022 + ... + 25648.

It is an arithmetic number, because the mean of its divisors is an integer number (38512728).

Almost surely, 2^256664545 is an apocalyptic number.

It is an amenable number.

256664545 is a deficient number, since it is larger than the sum of its proper divisors (51437279).

256664545 is a wasteful number, since it uses less digits than its factorization.

256664545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17399.

The product of its digits is 864000, while the sum is 43.

The square root of 256664545 is about 16020.7535715396. The cubic root of 256664545 is about 635.5093728441.

The spelling of 256664545 in words is "two hundred fifty-six million, six hundred sixty-four thousand, five hundred forty-five".