165323689 has 2 divisors, whose sum is σ = 165323690. Its totient is φ = 165323688.

The previous prime is 165323687. The next prime is 165323707. The reversal of 165323689 is 986323561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115197289 + 50126400 = 10733^2 + 7080^2 .

It is a cyclic number.

It is not a de Polignac number, because 165323689 - 2¹ = 165323687 is a prime.

Together with 165323687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165323687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82661844 + 82661845.

It is an arithmetic number, because the mean of its divisors is an integer number (82661845).

Almost surely, 2^165323689 is an apocalyptic number.

It is an amenable number.

165323689 is a deficient number, since it is larger than the sum of its proper divisors (1).

165323689 is an equidigital number, since it uses as much as digits as its factorization.

165323689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 43.

The square root of 165323689 is about 12857.8259826457. The cubic root of 165323689 is about 548.8390818828.

The spelling of 165323689 in words is "one hundred sixty-five million, three hundred twenty-three thousand, six hundred eighty-nine".