665445023 has 8 divisors (see below), whose sum is σ = 672503040. Its totient is φ = 658417240.

The previous prime is 665444987. The next prime is 665445041. The reversal of 665445023 is 320544566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665445023 - 2²⁶ = 598336159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665445073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38138 + ... + 52776.

It is an arithmetic number, because the mean of its divisors is an integer number (84062880).

Almost surely, 2^665445023 is an apocalyptic number.

665445023 is a deficient number, since it is larger than the sum of its proper divisors (7058017).

665445023 is a wasteful number, since it uses less digits than its factorization.

665445023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15117.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 665445023 is about 25796.2210992230. The cubic root of 665445023 is about 873.0465364473.

Adding to 665445023 its reverse (320544566), we get a palindrome (985989589).

The spelling of 665445023 in words is "six hundred sixty-five million, four hundred forty-five thousand, twenty-three".