256410333649 has 2 divisors, whose sum is σ = 256410333650. Its totient is φ = 256410333648.

The previous prime is 256410333637. The next prime is 256410333653. The reversal of 256410333649 is 946333014652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256408551424 + 1782225 = 506368^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 256410333649 - 2⁷ = 256410333521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256410333599 and 256410333608.

It is not a weakly prime, because it can be changed into another prime (256410333659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128205166824 + 128205166825.

It is an arithmetic number, because the mean of its divisors is an integer number (128205166825).

Almost surely, 2^256410333649 is an apocalyptic number.

It is an amenable number.

256410333649 is a deficient number, since it is larger than the sum of its proper divisors (1).

256410333649 is an equidigital number, since it uses as much as digits as its factorization.

256410333649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 256410333649 in words is "two hundred fifty-six billion, four hundred ten million, three hundred thirty-three thousand, six hundred forty-nine".