165668 has 12 divisors (see below), whose sum is σ = 294000. Its totient is φ = 81672.

The previous prime is 165667. The next prime is 165673. The reversal of 165668 is 866561.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (165667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (24500).

2¹⁶⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

165668 is a deficient number, since it is larger than the sum of its proper divisors (128332).

165668 is a wasteful number, since it uses less digits than its factorization.

165668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 584 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 165668 is about 407.0233408541. The cubic root of 165668 is about 54.9219830500.

The spelling of 165668 in words is "one hundred sixty-five thousand, six hundred sixty-eight".