205985338697 has 2 divisors, whose sum is σ = 205985338698. Its totient is φ = 205985338696.

The previous prime is 205985338687. The next prime is 205985338711. The reversal of 205985338697 is 796833589502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197828358841 + 8156979856 = 444779^2 + 90316^2 .

It is a cyclic number.

It is not a de Polignac number, because 205985338697 - 2⁴ = 205985338681 is a prime.

It is not a weakly prime, because it can be changed into another prime (205985338607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102992669348 + 102992669349.

It is an arithmetic number, because the mean of its divisors is an integer number (102992669349).

Almost surely, 2^205985338697 is an apocalyptic number.

It is an amenable number.

205985338697 is a deficient number, since it is larger than the sum of its proper divisors (1).

205985338697 is an equidigital number, since it uses as much as digits as its factorization.

205985338697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97977600, while the sum is 65.

The spelling of 205985338697 in words is "two hundred five billion, nine hundred eighty-five million, three hundred thirty-eight thousand, six hundred ninety-seven".