205668086969 has 2 divisors, whose sum is σ = 205668086970. Its totient is φ = 205668086968.

The previous prime is 205668086941. The next prime is 205668086999. The reversal of 205668086969 is 969680866502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167706630400 + 37961456569 = 409520^2 + 194837^2 .

It is a cyclic number.

It is not a de Polignac number, because 205668086969 - 2²⁰ = 205667038393 is a prime.

It is a super-3 number, since 3×205668086969³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (205668086999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102834043484 + 102834043485.

It is an arithmetic number, because the mean of its divisors is an integer number (102834043485).

Almost surely, 2^205668086969 is an apocalyptic number.

It is an amenable number.

205668086969 is a deficient number, since it is larger than the sum of its proper divisors (1).

205668086969 is an equidigital number, since it uses as much as digits as its factorization.

205668086969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67184640, while the sum is 65.

The spelling of 205668086969 in words is "two hundred five billion, six hundred sixty-eight million, eighty-six thousand, nine hundred sixty-nine".