165042823 has 4 divisors (see below), whose sum is σ = 180046728. Its totient is φ = 150038920.

The previous prime is 165042769. The next prime is 165042827. The reversal of 165042823 is 328240561.

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-165042823 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165042827) 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, 7501936 + ... + 7501957.

It is an arithmetic number, because the mean of its divisors is an integer number (45011682).

Almost surely, 2^165042823 is an apocalyptic number.

165042823 is a deficient number, since it is larger than the sum of its proper divisors (15003905).

165042823 is a wasteful number, since it uses less digits than its factorization.

165042823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15003904.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 165042823 is about 12846.8993535405. The cubic root of 165042823 is about 548.5281008098.

The spelling of 165042823 in words is "one hundred sixty-five million, forty-two thousand, eight hundred twenty-three".