205928717087 has 2 divisors, whose sum is σ = 205928717088. Its totient is φ = 205928717086.

The previous prime is 205928717081. The next prime is 205928717131. The reversal of 205928717087 is 780717829502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205928717087 - 2²⁰ = 205927668511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205928717081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102964358543 + 102964358544.

It is an arithmetic number, because the mean of its divisors is an integer number (102964358544).

Almost surely, 2^205928717087 is an apocalyptic number.

205928717087 is a deficient number, since it is larger than the sum of its proper divisors (1).

205928717087 is an equidigital number, since it uses as much as digits as its factorization.

205928717087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3951360, while the sum is 56.

The spelling of 205928717087 in words is "two hundred five billion, nine hundred twenty-eight million, seven hundred seventeen thousand, eighty-seven".