208866428297 has 2 divisors, whose sum is σ = 208866428298. Its totient is φ = 208866428296.

The previous prime is 208866428257. The next prime is 208866428321. The reversal of 208866428297 is 792824668802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113984563456 + 94881864841 = 337616^2 + 308029^2 .

It is a cyclic number.

It is not a de Polignac number, because 208866428297 - 2²⁰ = 208865379721 is a prime.

It is not a weakly prime, because it can be changed into another prime (208866428257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104433214148 + 104433214149.

It is an arithmetic number, because the mean of its divisors is an integer number (104433214149).

Almost surely, 2^208866428297 is an apocalyptic number.

It is an amenable number.

208866428297 is a deficient number, since it is larger than the sum of its proper divisors (1).

208866428297 is an equidigital number, since it uses as much as digits as its factorization.

208866428297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37158912, while the sum is 62.

The spelling of 208866428297 in words is "two hundred eight billion, eight hundred sixty-six million, four hundred twenty-eight thousand, two hundred ninety-seven".