205912326201917 has 2 divisors, whose sum is σ = 205912326201918. Its totient is φ = 205912326201916.

The previous prime is 205912326201839. The next prime is 205912326201937. The reversal of 205912326201917 is 719102623219502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164837122109881 + 41075204092036 = 12838891^2 + 6408994^2 .

It is a cyclic number.

It is not a de Polignac number, because 205912326201917 - 2³⁸ = 205637448294973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205912326201937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102956163100958 + 102956163100959.

It is an arithmetic number, because the mean of its divisors is an integer number (102956163100959).

Almost surely, 2^{205912326201917} is an apocalyptic number.

It is an amenable number.

205912326201917 is a deficient number, since it is larger than the sum of its proper divisors (1).

205912326201917 is an equidigital number, since it uses as much as digits as its factorization.

205912326201917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 205912326201917 in words is "two hundred five trillion, nine hundred twelve billion, three hundred twenty-six million, two hundred one thousand, nine hundred seventeen".