165322909309 has 2 divisors, whose sum is σ = 165322909310. Its totient is φ = 165322909308.

The previous prime is 165322909249. The next prime is 165322909441. The reversal of 165322909309 is 903909223561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164766987225 + 555922084 = 405915^2 + 23578^2 .

It is an emirp because it is prime and its reverse (903909223561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165322909309 - 2⁷ = 165322909181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165322909709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82661454654 + 82661454655.

It is an arithmetic number, because the mean of its divisors is an integer number (82661454655).

Almost surely, 2^165322909309 is an apocalyptic number.

It is an amenable number.

165322909309 is a deficient number, since it is larger than the sum of its proper divisors (1).

165322909309 is an equidigital number, since it uses as much as digits as its factorization.

165322909309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 787320, while the sum is 49.

The spelling of 165322909309 in words is "one hundred sixty-five billion, three hundred twenty-two million, nine hundred nine thousand, three hundred nine".