165145223 has 4 divisors (see below), whose sum is σ = 165224640. Its totient is φ = 165065808.

The previous prime is 165145187. The next prime is 165145231. The reversal of 165145223 is 322541561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165145223 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 (165145423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36503 + ... + 40776.

It is an arithmetic number, because the mean of its divisors is an integer number (41306160).

Almost surely, 2^165145223 is an apocalyptic number.

165145223 is a deficient number, since it is larger than the sum of its proper divisors (79417).

165145223 is an equidigital number, since it uses as much as digits as its factorization.

165145223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79416.

The product of its digits is 7200, while the sum is 29.

The square root of 165145223 is about 12850.8841330081. The cubic root of 165145223 is about 548.6415212015.

Adding to 165145223 its reverse (322541561), we get a palindrome (487686784).

The spelling of 165145223 in words is "one hundred sixty-five million, one hundred forty-five thousand, two hundred twenty-three".