256220611 has 8 divisors (see below), whose sum is σ = 268213248. Its totient is φ = 244461000.

The previous prime is 256220599. The next prime is 256220623. The reversal of 256220611 is 116022652.

It is an interprime number because it is at equal distance from previous prime (256220599) and next prime (256220623).

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 256220611 - 2²⁷ = 122002883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256220011) 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, 56005 + ... + 60406.

It is an arithmetic number, because the mean of its divisors is an integer number (33526656).

Almost surely, 2^256220611 is an apocalyptic number.

256220611 is the 7159-th centered decagonal number.

256220611 is a deficient number, since it is larger than the sum of its proper divisors (11992637).

256220611 is a wasteful number, since it uses less digits than its factorization.

256220611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116513.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 256220611 is about 16006.8926091231. The cubic root of 256220611 is about 635.1427632799.

The spelling of 256220611 in words is "two hundred fifty-six million, two hundred twenty thousand, six hundred eleven".