165665327 has 2 divisors, whose sum is σ = 165665328. Its totient is φ = 165665326.

The previous prime is 165665299. The next prime is 165665329. The reversal of 165665327 is 723566561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165665327 is a prime.

Together with 165665329, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165665329) 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, 82832663 + 82832664.

It is an arithmetic number, because the mean of its divisors is an integer number (82832664).

Almost surely, 2^165665327 is an apocalyptic number.

165665327 is a deficient number, since it is larger than the sum of its proper divisors (1).

165665327 is an equidigital number, since it uses as much as digits as its factorization.

165665327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 41.

The square root of 165665327 is about 12871.1043426739. The cubic root of 165665327 is about 549.2168766553.

The spelling of 165665327 in words is "one hundred sixty-five million, six hundred sixty-five thousand, three hundred twenty-seven".