208664443129 has 2 divisors, whose sum is σ = 208664443130. Its totient is φ = 208664443128.

The previous prime is 208664443103. The next prime is 208664443151. The reversal of 208664443129 is 921344466802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106440367504 + 102224075625 = 326252^2 + 319725^2 .

It is a cyclic number.

It is not a de Polignac number, because 208664443129 - 2²¹ = 208662345977 is a prime.

It is not a weakly prime, because it can be changed into another prime (208664440129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104332221564 + 104332221565.

It is an arithmetic number, because the mean of its divisors is an integer number (104332221565).

Almost surely, 2^208664443129 is an apocalyptic number.

It is an amenable number.

208664443129 is a deficient number, since it is larger than the sum of its proper divisors (1).

208664443129 is an equidigital number, since it uses as much as digits as its factorization.

208664443129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 49.

The spelling of 208664443129 in words is "two hundred eight billion, six hundred sixty-four million, four hundred forty-three thousand, one hundred twenty-nine".