165404023 has 16 divisors (see below), whose sum is σ = 177156000. Its totient is φ = 154127232.

The previous prime is 165404011. The next prime is 165404059. The reversal of 165404023 is 320404561.

It is a cyclic number.

It is not a de Polignac number, because 165404023 - 2²⁵ = 131849591 is a prime.

It is a super-3 number, since 3×165404023³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165404093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148593 + ... + 149701.

It is an arithmetic number, because the mean of its divisors is an integer number (11072250).

Almost surely, 2^165404023 is an apocalyptic number.

165404023 is a deficient number, since it is larger than the sum of its proper divisors (11751977).

165404023 is a wasteful number, since it uses less digits than its factorization.

165404023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 165404023 is about 12860.9495372620. The cubic root of 165404023 is about 548.9279646871.

Adding to 165404023 its reverse (320404561), we get a palindrome (485808584).

The spelling of 165404023 in words is "one hundred sixty-five million, four hundred four thousand, twenty-three".