209553561089 has 2 divisors, whose sum is σ = 209553561090. Its totient is φ = 209553561088.

The previous prime is 209553561073. The next prime is 209553561167. The reversal of 209553561089 is 980165355902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208673548864 + 880012225 = 456808^2 + 29665^2 .

It is a cyclic number.

It is not a de Polignac number, because 209553561089 - 2⁴ = 209553561073 is a prime.

It is a super-3 number, since 3×209553561089³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 209553561089.

It is not a weakly prime, because it can be changed into another prime (209553561389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104776780544 + 104776780545.

It is an arithmetic number, because the mean of its divisors is an integer number (104776780545).

Almost surely, 2^209553561089 is an apocalyptic number.

It is an amenable number.

209553561089 is a deficient number, since it is larger than the sum of its proper divisors (1).

209553561089 is an equidigital number, since it uses as much as digits as its factorization.

209553561089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 209553561089 in words is "two hundred nine billion, five hundred fifty-three million, five hundred sixty-one thousand, eighty-nine".