208397222861 has 2 divisors, whose sum is σ = 208397222862. Its totient is φ = 208397222860.

The previous prime is 208397222833. The next prime is 208397222893. The reversal of 208397222861 is 168222793802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123486176836 + 84911046025 = 351406^2 + 291395^2 .

It is a cyclic number.

It is not a de Polignac number, because 208397222861 - 2⁶ = 208397222797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208397227861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104198611430 + 104198611431.

It is an arithmetic number, because the mean of its divisors is an integer number (104198611431).

Almost surely, 2^208397222861 is an apocalyptic number.

It is an amenable number.

208397222861 is a deficient number, since it is larger than the sum of its proper divisors (1).

208397222861 is an equidigital number, since it uses as much as digits as its factorization.

208397222861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 208397222861 in words is "two hundred eight billion, three hundred ninety-seven million, two hundred twenty-two thousand, eight hundred sixty-one".