165366321 has 16 divisors (see below), whose sum is σ = 224952000. Its totient is φ = 108024768.

The previous prime is 165366301. The next prime is 165366349. The reversal of 165366321 is 123663561.

165366321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165366321 - 2¹⁷ = 165235249 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165366301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60435 + ... + 63111.

It is an arithmetic number, because the mean of its divisors is an integer number (14059500).

Almost surely, 2^165366321 is an apocalyptic number.

It is an amenable number.

165366321 is a deficient number, since it is larger than the sum of its proper divisors (59585679).

165366321 is a wasteful number, since it uses less digits than its factorization.

165366321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088.

The product of its digits is 19440, while the sum is 33.

The square root of 165366321 is about 12859.4836988116. The cubic root of 165366321 is about 548.8862541845.

The spelling of 165366321 in words is "one hundred sixty-five million, three hundred sixty-six thousand, three hundred twenty-one".