256613450417 has 2 divisors, whose sum is σ = 256613450418. Its totient is φ = 256613450416.

The previous prime is 256613450413. The next prime is 256613450449. The reversal of 256613450417 is 714054316652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253536418576 + 3077031841 = 503524^2 + 55471^2 .

It is a cyclic number.

It is not a de Polignac number, because 256613450417 - 2² = 256613450413 is a prime.

It is not a weakly prime, because it can be changed into another prime (256613450413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128306725208 + 128306725209.

It is an arithmetic number, because the mean of its divisors is an integer number (128306725209).

Almost surely, 2^256613450417 is an apocalyptic number.

It is an amenable number.

256613450417 is a deficient number, since it is larger than the sum of its proper divisors (1).

256613450417 is an equidigital number, since it uses as much as digits as its factorization.

256613450417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 256613450417 in words is "two hundred fifty-six billion, six hundred thirteen million, four hundred fifty thousand, four hundred seventeen".