205286785013 has 2 divisors, whose sum is σ = 205286785014. Its totient is φ = 205286785012.

The previous prime is 205286784973. The next prime is 205286785043. The reversal of 205286785013 is 310587682502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130206948964 + 75079836049 = 360842^2 + 274007^2 .

It is a cyclic number.

It is not a de Polignac number, because 205286785013 - 2²⁰ = 205285736437 is a prime.

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 (205286785043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102643392506 + 102643392507.

It is an arithmetic number, because the mean of its divisors is an integer number (102643392507).

Almost surely, 2^205286785013 is an apocalyptic number.

It is an amenable number.

205286785013 is a deficient number, since it is larger than the sum of its proper divisors (1).

205286785013 is an equidigital number, since it uses as much as digits as its factorization.

205286785013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 205286785013 in words is "two hundred five billion, two hundred eighty-six million, seven hundred eighty-five thousand, thirteen".