165038123 has 16 divisors (see below), whose sum is σ = 178083840. Its totient is φ = 152474400.

The previous prime is 165038119. The next prime is 165038143. The reversal of 165038123 is 321830561.

It is a cyclic number.

It is not a de Polignac number, because 165038123 - 2² = 165038119 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165038143) 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 15 ways as a sum of consecutive naturals, for example, 151286 + ... + 152372.

It is an arithmetic number, because the mean of its divisors is an integer number (11130240).

Almost surely, 2^165038123 is an apocalyptic number.

165038123 is a deficient number, since it is larger than the sum of its proper divisors (13045717).

165038123 is a wasteful number, since it uses less digits than its factorization.

165038123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 165038123 is about 12846.7164287222. The cubic root of 165038123 is about 548.5228938652.

Adding to 165038123 its reverse (321830561), we get a palindrome (486868684).

The spelling of 165038123 in words is "one hundred sixty-five million, thirty-eight thousand, one hundred twenty-three".