165066321 has 16 divisors (see below), whose sum is σ = 252800000. Its totient is φ = 93847248.

The previous prime is 165066283. The next prime is 165066329. The reversal of 165066321 is 123660561.

It is not a de Polignac number, because 165066321 - 2⁶ = 165066257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165066329) 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, 15571 + ... + 23928.

It is an arithmetic number, because the mean of its divisors is an integer number (15800000).

Almost surely, 2^165066321 is an apocalyptic number.

It is an amenable number.

165066321 is a deficient number, since it is larger than the sum of its proper divisors (87733679).

165066321 is a wasteful number, since it uses less digits than its factorization.

165066321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39708.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 165066321 is about 12847.8138607313. The cubic root of 165066321 is about 548.5541318350.

The spelling of 165066321 in words is "one hundred sixty-five million, sixty-six thousand, three hundred twenty-one".