208815799189 has 2 divisors, whose sum is σ = 208815799190. Its totient is φ = 208815799188.

The previous prime is 208815799141. The next prime is 208815799217. The reversal of 208815799189 is 981997518802.

208815799189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147930236689 + 60885562500 = 384617^2 + 246750^2 .

It is a cyclic number.

It is not a de Polignac number, because 208815799189 - 2²⁵ = 208782244757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208815799289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104407899594 + 104407899595.

It is an arithmetic number, because the mean of its divisors is an integer number (104407899595).

Almost surely, 2^208815799189 is an apocalyptic number.

It is an amenable number.

208815799189 is a deficient number, since it is larger than the sum of its proper divisors (1).

208815799189 is an equidigital number, since it uses as much as digits as its factorization.

208815799189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 67.

The spelling of 208815799189 in words is "two hundred eight billion, eight hundred fifteen million, seven hundred ninety-nine thousand, one hundred eighty-nine".