209998561567 has 2 divisors, whose sum is σ = 209998561568. Its totient is φ = 209998561566.

The previous prime is 209998561519. The next prime is 209998561573. The reversal of 209998561567 is 765165899902.

209998561567 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 is a cyclic number.

It is not a de Polignac number, because 209998561567 - 2¹⁵ = 209998528799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209998561067) 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, 104999280783 + 104999280784.

It is an arithmetic number, because the mean of its divisors is an integer number (104999280784).

Almost surely, 2^209998561567 is an apocalyptic number.

209998561567 is a deficient number, since it is larger than the sum of its proper divisors (1).

209998561567 is an equidigital number, since it uses as much as digits as its factorization.

209998561567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73483200, while the sum is 67.

The spelling of 209998561567 in words is "two hundred nine billion, nine hundred ninety-eight million, five hundred sixty-one thousand, five hundred sixty-seven".