165622161 has 8 divisors (see below), whose sum is σ = 228444480. Its totient is φ = 106607312.

The previous prime is 165622159. The next prime is 165622199. The reversal of 165622161 is 161226561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165622161 - 2¹ = 165622159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165622141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 951765 + ... + 951938.

It is an arithmetic number, because the mean of its divisors is an integer number (28555560).

Almost surely, 2^165622161 is an apocalyptic number.

It is an amenable number.

165622161 is a deficient number, since it is larger than the sum of its proper divisors (62822319).

165622161 is a wasteful number, since it uses less digits than its factorization.

165622161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903735.

The product of its digits is 4320, while the sum is 30.

The square root of 165622161 is about 12869.4273765386. The cubic root of 165622161 is about 549.1691709273.

The spelling of 165622161 in words is "one hundred sixty-five million, six hundred twenty-two thousand, one hundred sixty-one".