256613450449 has 2 divisors, whose sum is σ = 256613450450. Its totient is φ = 256613450448.

The previous prime is 256613450417. The next prime is 256613450479. The reversal of 256613450449 is 944054316652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255169450449 + 1444000000 = 505143^2 + 38000^2 .

It is a cyclic number.

It is not a de Polignac number, because 256613450449 - 2⁵ = 256613450417 is a prime.

It is not a weakly prime, because it can be changed into another prime (256613450479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128306725224 + 128306725225.

It is an arithmetic number, because the mean of its divisors is an integer number (128306725225).

Almost surely, 2^256613450449 is an apocalyptic number.

It is an amenable number.

256613450449 is a deficient number, since it is larger than the sum of its proper divisors (1).

256613450449 is an equidigital number, since it uses as much as digits as its factorization.

256613450449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 256613450449 in words is "two hundred fifty-six billion, six hundred thirteen million, four hundred fifty thousand, four hundred forty-nine".