165647 has 4 divisors (see below), whose sum is σ = 166896. Its totient is φ = 164400.

The previous prime is 165617. The next prime is 165653. The reversal of 165647 is 746561.

165647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165647 - 2⁸ = 165391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398 + ... + 699.

It is an arithmetic number, because the mean of its divisors is an integer number (41724).

2¹⁶⁵⁶⁴⁷ is an apocalyptic number.

165647 is a deficient number, since it is larger than the sum of its proper divisors (1249).

165647 is a wasteful number, since it uses less digits than its factorization.

165647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248.

The product of its digits is 5040, while the sum is 29.

The square root of 165647 is about 406.9975429901. The cubic root of 165647 is about 54.9196623234.

The spelling of 165647 in words is "one hundred sixty-five thousand, six hundred forty-seven".