165693161 has 2 divisors, whose sum is σ = 165693162. Its totient is φ = 165693160.

The previous prime is 165693139. The next prime is 165693163. The reversal of 165693161 is 161396561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 36529936 = 11365^2 + 6044^2 .

It is a cyclic number.

It is not a de Polignac number, because 165693161 - 2⁶ = 165693097 is a prime.

Together with 165693163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165693163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82846580 + 82846581.

It is an arithmetic number, because the mean of its divisors is an integer number (82846581).

Almost surely, 2^165693161 is an apocalyptic number.

It is an amenable number.

165693161 is a deficient number, since it is larger than the sum of its proper divisors (1).

165693161 is an equidigital number, since it uses as much as digits as its factorization.

165693161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 165693161 is about 12872.1855564624. The cubic root of 165693161 is about 549.2476335368.

The spelling of 165693161 in words is "one hundred sixty-five million, six hundred ninety-three thousand, one hundred sixty-one".