165161173 has 4 divisors (see below), whose sum is σ = 165198880. Its totient is φ = 165123468.

The previous prime is 165161147. The next prime is 165161207. The reversal of 165161173 is 371161561.

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.

It is a cyclic number.

It is not a de Polignac number, because 165161173 - 2⁵ = 165161141 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 (165168173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11265 + ... + 21382.

It is an arithmetic number, because the mean of its divisors is an integer number (41299720).

Almost surely, 2^165161173 is an apocalyptic number.

It is an amenable number.

165161173 is a deficient number, since it is larger than the sum of its proper divisors (37707).

165161173 is an equidigital number, since it uses as much as digits as its factorization.

165161173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37706.

The product of its digits is 3780, while the sum is 31.

The square root of 165161173 is about 12851.5046978943. The cubic root of 165161173 is about 548.6591835361.

It can be divided in two parts, 16516 and 1173, that added together give a square (17689 = 133²).

The spelling of 165161173 in words is "one hundred sixty-five million, one hundred sixty-one thousand, one hundred seventy-three".