208797861901 has 2 divisors, whose sum is σ = 208797861902. Its totient is φ = 208797861900.

The previous prime is 208797861733. The next prime is 208797861919. The reversal of 208797861901 is 109168797802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162788040900 + 46009821001 = 403470^2 + 214499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208797861901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208797861971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104398930950 + 104398930951.

It is an arithmetic number, because the mean of its divisors is an integer number (104398930951).

Almost surely, 2^208797861901 is an apocalyptic number.

It is an amenable number.

208797861901 is a deficient number, since it is larger than the sum of its proper divisors (1).

208797861901 is an equidigital number, since it uses as much as digits as its factorization.

208797861901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 58.

The spelling of 208797861901 in words is "two hundred eight billion, seven hundred ninety-seven million, eight hundred sixty-one thousand, nine hundred one".