208163974897 has 2 divisors, whose sum is σ = 208163974898. Its totient is φ = 208163974896.

The previous prime is 208163974841. The next prime is 208163975027. The reversal of 208163974897 is 798479361802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202356925281 + 5807049616 = 449841^2 + 76204^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208163974897 is a prime.

It is not a weakly prime, because it can be changed into another prime (208163674897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104081987448 + 104081987449.

It is an arithmetic number, because the mean of its divisors is an integer number (104081987449).

Almost surely, 2^208163974897 is an apocalyptic number.

It is an amenable number.

208163974897 is a deficient number, since it is larger than the sum of its proper divisors (1).

208163974897 is an equidigital number, since it uses as much as digits as its factorization.

208163974897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 208163974897 in words is "two hundred eight billion, one hundred sixty-three million, nine hundred seventy-four thousand, eight hundred ninety-seven".