205780537013 has 2 divisors, whose sum is σ = 205780537014. Its totient is φ = 205780537012.

The previous prime is 205780536991. The next prime is 205780537051. The reversal of 205780537013 is 310735087502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144550519204 + 61230017809 = 380198^2 + 247447^2 .

It is a cyclic number.

It is not a de Polignac number, because 205780537013 - 2²⁰ = 205779488437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205780534013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102890268506 + 102890268507.

It is an arithmetic number, because the mean of its divisors is an integer number (102890268507).

Almost surely, 2^205780537013 is an apocalyptic number.

It is an amenable number.

205780537013 is a deficient number, since it is larger than the sum of its proper divisors (1).

205780537013 is an equidigital number, since it uses as much as digits as its factorization.

205780537013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 205780537013 in words is "two hundred five billion, seven hundred eighty million, five hundred thirty-seven thousand, thirteen".