206808909829 has 2 divisors, whose sum is σ = 206808909830. Its totient is φ = 206808909828.

The previous prime is 206808909823. The next prime is 206808909841. The reversal of 206808909829 is 928909808602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125441347329 + 81367562500 = 354177^2 + 285250^2 .

It is a cyclic number.

It is not a de Polignac number, because 206808909829 - 2²¹ = 206806812677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206808909823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103404454914 + 103404454915.

It is an arithmetic number, because the mean of its divisors is an integer number (103404454915).

Almost surely, 2^206808909829 is an apocalyptic number.

It is an amenable number.

206808909829 is a deficient number, since it is larger than the sum of its proper divisors (1).

206808909829 is an equidigital number, since it uses as much as digits as its factorization.

206808909829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 206808909829 in words is "two hundred six billion, eight hundred eight million, nine hundred nine thousand, eight hundred twenty-nine".