256610511 has 10 divisors (see below), whose sum is σ = 383331872. Its totient is φ = 171073620.

The previous prime is 256610507. The next prime is 256610521. The reversal of 256610511 is 115016652.

It is a happy number.

It is not a de Polignac number, because 256610511 - 2² = 256610507 is a prime.

It is a super-2 number, since 2×256610511² = 131697908711362242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256610521) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1583935 + ... + 1584096.

Almost surely, 2^256610511 is an apocalyptic number.

256610511 is a deficient number, since it is larger than the sum of its proper divisors (126721361).

256610511 is an equidigital number, since it uses as much as digits as its factorization.

256610511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168043 (or 3168034 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 256610511 is about 16019.0671076689. The cubic root of 256610511 is about 635.4647730943.

The spelling of 256610511 in words is "two hundred fifty-six million, six hundred ten thousand, five hundred eleven".