256414661 has 2 divisors, whose sum is σ = 256414662. Its totient is φ = 256414660.

The previous prime is 256414619. The next prime is 256414667. The reversal of 256414661 is 166414652.

256414661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173422561 + 82992100 = 13169^2 + 9110^2 .

It is a cyclic number.

It is not a de Polignac number, because 256414661 - 2¹⁴ = 256398277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256414667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128207330 + 128207331.

It is an arithmetic number, because the mean of its divisors is an integer number (128207331).

Almost surely, 2^256414661 is an apocalyptic number.

It is an amenable number.

256414661 is a deficient number, since it is larger than the sum of its proper divisors (1).

256414661 is an equidigital number, since it uses as much as digits as its factorization.

256414661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 256414661 is about 16012.9529131887. The cubic root of 256414661 is about 635.3030656996.

Subtracting from 256414661 its reverse (166414652), we obtain a palindrome (90000009).

The spelling of 256414661 in words is "two hundred fifty-six million, four hundred fourteen thousand, six hundred sixty-one".