665023 has 4 divisors (see below), whose sum is σ = 704160. Its totient is φ = 625888.

The previous prime is 665017. The next prime is 665029. The reversal of 665023 is 320566.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (665017) and next prime (665029).

It is a cyclic number.

It is not a de Polignac number, because 665023 - 2⁹ = 664511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664985 and 665003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665029) 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, 19543 + ... + 19576.

It is an arithmetic number, because the mean of its divisors is an integer number (176040).

2⁶⁶⁵⁰²³ is an apocalyptic number.

665023 is a deficient number, since it is larger than the sum of its proper divisors (39137).

665023 is a wasteful number, since it uses less digits than its factorization.

665023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39136.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 665023 is about 815.4894235979. The cubic root of 665023 is about 87.2861936357.

Adding to 665023 its reverse (320566), we get a palindrome (985589).

The spelling of 665023 in words is "six hundred sixty-five thousand, twenty-three".