165201161 has 4 divisors (see below), whose sum is σ = 165349392. Its totient is φ = 165052932.

The previous prime is 165201151. The next prime is 165201199. The reversal of 165201161 is 161102561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161102561 = 283 ⋅569267.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165201161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165201151) 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, 72431 + ... + 74676.

It is an arithmetic number, because the mean of its divisors is an integer number (41337348).

Almost surely, 2^165201161 is an apocalyptic number.

It is an amenable number.

165201161 is a deficient number, since it is larger than the sum of its proper divisors (148231).

165201161 is a wasteful number, since it uses less digits than its factorization.

165201161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148230.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 165201161 is about 12853.0603748679. The cubic root of 165201161 is about 548.7034595053.

The spelling of 165201161 in words is "one hundred sixty-five million, two hundred one thousand, one hundred sixty-one".