165623033 has 4 divisors (see below), whose sum is σ = 165656400. Its totient is φ = 165589668.

The previous prime is 165623021. The next prime is 165623041. The reversal of 165623033 is 330326561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 330326561 = 4001 ⋅82561.

It is a cyclic number.

It is not a de Polignac number, because 165623033 - 2¹⁸ = 165360889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165622987 and 165623005.

It is not an unprimeable number, because it can be changed into a prime (165623093) 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, 7583 + ... + 19716.

It is an arithmetic number, because the mean of its divisors is an integer number (41414100).

Almost surely, 2^165623033 is an apocalyptic number.

It is an amenable number.

165623033 is a deficient number, since it is larger than the sum of its proper divisors (33367).

165623033 is an equidigital number, since it uses as much as digits as its factorization.

165623033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33366.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 165623033 is about 12869.4612552352. The cubic root of 165623033 is about 549.1701347168.

Adding to 165623033 its reverse (330326561), we get a palindrome (495949594).

The spelling of 165623033 in words is "one hundred sixty-five million, six hundred twenty-three thousand, thirty-three".