165204023 has 4 divisors (see below), whose sum is σ = 165257400. Its totient is φ = 165150648.

The previous prime is 165203999. The next prime is 165204077. The reversal of 165204023 is 320402561.

165204023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320402561 = 61 ⋅5252501.

It is a cyclic number.

It is not a de Polignac number, because 165204023 - 2⁶ = 165203959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165204023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165203023) 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, 21740 + ... + 28337.

It is an arithmetic number, because the mean of its divisors is an integer number (41314350).

Almost surely, 2^165204023 is an apocalyptic number.

165204023 is a deficient number, since it is larger than the sum of its proper divisors (53377).

165204023 is an equidigital number, since it uses as much as digits as its factorization.

165204023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53376.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 165204023 is about 12853.1717097376. The cubic root of 165204023 is about 548.7066281275.

Adding to 165204023 its reverse (320402561), we get a palindrome (485606584).

The spelling of 165204023 in words is "one hundred sixty-five million, two hundred four thousand, twenty-three".