206623237549 has 2 divisors, whose sum is σ = 206623237550. Its totient is φ = 206623237548.

The previous prime is 206623237523. The next prime is 206623237571. The reversal of 206623237549 is 945732326602.

206623237549 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., 124192808100 + 82430429449 = 352410^2 + 287107^2 .

It is a cyclic number.

It is not a de Polignac number, because 206623237549 - 2⁵ = 206623237517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206623237049) 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, 103311618774 + 103311618775.

It is an arithmetic number, because the mean of its divisors is an integer number (103311618775).

Almost surely, 2^206623237549 is an apocalyptic number.

It is an amenable number.

206623237549 is a deficient number, since it is larger than the sum of its proper divisors (1).

206623237549 is an equidigital number, since it uses as much as digits as its factorization.

206623237549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 49.

The spelling of 206623237549 in words is "two hundred six billion, six hundred twenty-three million, two hundred thirty-seven thousand, five hundred forty-nine".