206044140649 has 2 divisors, whose sum is σ = 206044140650. Its totient is φ = 206044140648.

The previous prime is 206044140619. The next prime is 206044140667. The reversal of 206044140649 is 946041440602.

206044140649 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., 203942560000 + 2101580649 = 451600^2 + 45843^2 .

It is a cyclic number.

It is not a de Polignac number, because 206044140649 - 2⁷ = 206044140521 is a prime.

It is not a weakly prime, because it can be changed into another prime (206044140619) 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, 103022070324 + 103022070325.

It is an arithmetic number, because the mean of its divisors is an integer number (103022070325).

Almost surely, 2^206044140649 is an apocalyptic number.

It is an amenable number.

206044140649 is a deficient number, since it is larger than the sum of its proper divisors (1).

206044140649 is an equidigital number, since it uses as much as digits as its factorization.

206044140649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 206044140649 in words is "two hundred six billion, forty-four million, one hundred forty thousand, six hundred forty-nine".