256366321 has 8 divisors (see below), whose sum is σ = 260756064. Its totient is φ = 251993280.

The previous prime is 256366289. The next prime is 256366361. The reversal of 256366321 is 123663652.

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 256366321 - 2⁵ = 256366289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256366361) 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, 29001 + ... + 36793.

It is an arithmetic number, because the mean of its divisors is an integer number (32594508).

Almost surely, 2^256366321 is an apocalyptic number.

It is an amenable number.

256366321 is a deficient number, since it is larger than the sum of its proper divisors (4389743).

256366321 is an equidigital number, since it uses as much as digits as its factorization.

256366321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8351.

The product of its digits is 38880, while the sum is 34.

The square root of 256366321 is about 16011.4434389908. The cubic root of 256366321 is about 635.2631401611.

The spelling of 256366321 in words is "two hundred fifty-six million, three hundred sixty-six thousand, three hundred twenty-one".