165630230209 has 2 divisors, whose sum is σ = 165630230210. Its totient is φ = 165630230208.

The previous prime is 165630230201. The next prime is 165630230219. The reversal of 165630230209 is 902032036561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157398660225 + 8231569984 = 396735^2 + 90728^2 .

It is a cyclic number.

It is not a de Polignac number, because 165630230209 - 2³ = 165630230201 is a prime.

It is not a weakly prime, because it can be changed into another prime (165630230201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82815115104 + 82815115105.

It is an arithmetic number, because the mean of its divisors is an integer number (82815115105).

Almost surely, 2^165630230209 is an apocalyptic number.

It is an amenable number.

165630230209 is a deficient number, since it is larger than the sum of its proper divisors (1).

165630230209 is an equidigital number, since it uses as much as digits as its factorization.

165630230209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The spelling of 165630230209 in words is "one hundred sixty-five billion, six hundred thirty million, two hundred thirty thousand, two hundred nine".