256475569 has 8 divisors (see below), whose sum is σ = 299351808. Its totient is φ = 215158560.

The previous prime is 256475543. The next prime is 256475579. The reversal of 256475569 is 965574652.

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 256475569 - 2¹⁷ = 256344497 is a prime.

It is a super-2 number, since 2×256475569² = 131559434987747522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256475519) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 389452 + ... + 390109.

It is an arithmetic number, because the mean of its divisors is an integer number (37418976).

Almost surely, 2^256475569 is an apocalyptic number.

It is an amenable number.

256475569 is a deficient number, since it is larger than the sum of its proper divisors (42876239).

256475569 is an equidigital number, since it uses as much as digits as its factorization.

256475569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779615.

The product of its digits is 2268000, while the sum is 49.

The square root of 256475569 is about 16014.8546356188. The cubic root of 256475569 is about 635.3533644040.

The spelling of 256475569 in words is "two hundred fifty-six million, four hundred seventy-five thousand, five hundred sixty-nine".