256725185 has 8 divisors (see below), whose sum is σ = 308620800. Its totient is φ = 205013104.

The previous prime is 256725181. The next prime is 256725191. The reversal of 256725185 is 581527652.

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 256725185 - 2² = 256725181 is a prime.

It is a super-2 number, since 2×256725185² = 131815641226568450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256725181) 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, 42785 + ... + 48414.

It is an arithmetic number, because the mean of its divisors is an integer number (38577600).

Almost surely, 2^256725185 is an apocalyptic number.

It is an amenable number.

256725185 is a deficient number, since it is larger than the sum of its proper divisors (51895615).

256725185 is an equidigital number, since it uses as much as digits as its factorization.

256725185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91767.

The product of its digits is 168000, while the sum is 41.

The square root of 256725185 is about 16022.6460049519. The cubic root of 256725185 is about 635.5594177433.

The spelling of 256725185 in words is "two hundred fifty-six million, seven hundred twenty-five thousand, one hundred eighty-five".