205849245490613 has 2 divisors, whose sum is σ = 205849245490614. Its totient is φ = 205849245490612.

The previous prime is 205849245490549. The next prime is 205849245490631. The reversal of 205849245490613 is 316094542948502.

Together with next prime (205849245490631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191164967842564 + 14684277648049 = 13826242^2 + 3832007^2 .

It is a cyclic number.

It is not a de Polignac number, because 205849245490613 - 2⁶ = 205849245490549 is a prime.

It is a super-2 number, since 2×205849245490613² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205849245490013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102924622745306 + 102924622745307.

It is an arithmetic number, because the mean of its divisors is an integer number (102924622745307).

Almost surely, 2^{205849245490613} is an apocalyptic number.

It is an amenable number.

205849245490613 is a deficient number, since it is larger than the sum of its proper divisors (1).

205849245490613 is an equidigital number, since it uses as much as digits as its factorization.

205849245490613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74649600, while the sum is 62.

The spelling of 205849245490613 in words is "two hundred five trillion, eight hundred forty-nine billion, two hundred forty-five million, four hundred ninety thousand, six hundred thirteen".