205065500071987 has 2 divisors, whose sum is σ = 205065500071988. Its totient is φ = 205065500071986.

The previous prime is 205065500071981. The next prime is 205065500072057. The reversal of 205065500071987 is 789170005560502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205065500071987 - 2¹¹ = 205065500069939 is a prime.

It is not a weakly prime, because it can be changed into another prime (205065500071981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102532750035993 + 102532750035994.

It is an arithmetic number, because the mean of its divisors is an integer number (102532750035994).

Almost surely, 2^{205065500071987} is an apocalyptic number.

205065500071987 is a deficient number, since it is larger than the sum of its proper divisors (1).

205065500071987 is an equidigital number, since it uses as much as digits as its factorization.

205065500071987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292000, while the sum is 55.

The spelling of 205065500071987 in words is "two hundred five trillion, sixty-five billion, five hundred million, seventy-one thousand, nine hundred eighty-seven".