216535233516449 has 2 divisors, whose sum is σ = 216535233516450. Its totient is φ = 216535233516448.

The previous prime is 216535233516401. The next prime is 216535233516451. The reversal of 216535233516449 is 944615332535612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160890451747600 + 55644781768849 = 12684260^2 + 7459543^2 .

It is a cyclic number.

It is not a de Polignac number, because 216535233516449 - 2⁸ = 216535233516193 is a prime.

It is a Sophie Germain prime.

Together with 216535233516451, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (216535233513449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108267616758224 + 108267616758225.

It is an arithmetic number, because the mean of its divisors is an integer number (108267616758225).

Almost surely, 2^{216535233516449} is an apocalyptic number.

It is an amenable number.

216535233516449 is a deficient number, since it is larger than the sum of its proper divisors (1).

216535233516449 is an equidigital number, since it uses as much as digits as its factorization.

216535233516449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984000, while the sum is 59.

The spelling of 216535233516449 in words is "two hundred sixteen trillion, five hundred thirty-five billion, two hundred thirty-three million, five hundred sixteen thousand, four hundred forty-nine".