205385000813 has 2 divisors, whose sum is σ = 205385000814. Its totient is φ = 205385000812.

The previous prime is 205385000801. The next prime is 205385000851. The reversal of 205385000813 is 318000583502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201266185129 + 4118815684 = 448627^2 + 64178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205385000813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205385000893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102692500406 + 102692500407.

It is an arithmetic number, because the mean of its divisors is an integer number (102692500407).

Almost surely, 2^205385000813 is an apocalyptic number.

It is an amenable number.

205385000813 is a deficient number, since it is larger than the sum of its proper divisors (1).

205385000813 is an equidigital number, since it uses as much as digits as its factorization.

205385000813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 205385000813 in words is "two hundred five billion, three hundred eighty-five million, eight hundred thirteen", and thus it is an aban number.