206158430809 has 2 divisors, whose sum is σ = 206158430810. Its totient is φ = 206158430808.

The previous prime is 206158430747. The next prime is 206158430831. The reversal of 206158430809 is 908034851602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168161505625 + 37996925184 = 410075^2 + 194928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206158430809 is a prime.

It is not a weakly prime, because it can be changed into another prime (206158430879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103079215404 + 103079215405.

It is an arithmetic number, because the mean of its divisors is an integer number (103079215405).

Almost surely, 2^206158430809 is an apocalyptic number.

It is an amenable number.

206158430809 is a deficient number, since it is larger than the sum of its proper divisors (1).

206158430809 is an equidigital number, since it uses as much as digits as its factorization.

206158430809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 206158430809 in words is "two hundred six billion, one hundred fifty-eight million, four hundred thirty thousand, eight hundred nine".