205385205187 has 2 divisors, whose sum is σ = 205385205188. Its totient is φ = 205385205186.

The previous prime is 205385205161. The next prime is 205385205227. The reversal of 205385205187 is 781502583502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205385205187 - 2¹⁹ = 205384680899 is a prime.

It is not a weakly prime, because it can be changed into another prime (205385205287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102692602593 + 102692602594.

It is an arithmetic number, because the mean of its divisors is an integer number (102692602594).

Almost surely, 2^205385205187 is an apocalyptic number.

205385205187 is a deficient number, since it is larger than the sum of its proper divisors (1).

205385205187 is an equidigital number, since it uses as much as digits as its factorization.

205385205187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672000, while the sum is 46.

Adding to 205385205187 its reverse (781502583502), we get a palindrome (986887788689).

The spelling of 205385205187 in words is "two hundred five billion, three hundred eighty-five million, two hundred five thousand, one hundred eighty-seven".