209764652329 has 2 divisors, whose sum is σ = 209764652330. Its totient is φ = 209764652328.

The previous prime is 209764652327. The next prime is 209764652381. The reversal of 209764652329 is 923256467902.

209764652329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176841275625 + 32923376704 = 420525^2 + 181448^2 .

It is a cyclic number.

It is not a de Polignac number, because 209764652329 - 2¹ = 209764652327 is a prime.

Together with 209764652327, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 209764652329.

It is not a weakly prime, because it can be changed into another prime (209764652327) 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, 104882326164 + 104882326165.

It is an arithmetic number, because the mean of its divisors is an integer number (104882326165).

Almost surely, 2^209764652329 is an apocalyptic number.

It is an amenable number.

209764652329 is a deficient number, since it is larger than the sum of its proper divisors (1).

209764652329 is an equidigital number, since it uses as much as digits as its factorization.

209764652329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 55.

The spelling of 209764652329 in words is "two hundred nine billion, seven hundred sixty-four million, six hundred fifty-two thousand, three hundred twenty-nine".