665240323 has 4 divisors (see below), whose sum is σ = 725716728. Its totient is φ = 604763920.

The previous prime is 665240299. The next prime is 665240333. The reversal of 665240323 is 323042566.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 665240323 - 2⁵ = 665240291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665240333) 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, 30238186 + ... + 30238207.

It is an arithmetic number, because the mean of its divisors is an integer number (181429182).

Almost surely, 2^665240323 is an apocalyptic number.

665240323 is a deficient number, since it is larger than the sum of its proper divisors (60476405).

665240323 is a wasteful number, since it uses less digits than its factorization.

665240323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60476404.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 665240323 is about 25792.2531586521. The cubic root of 665240323 is about 872.9570069105.

Adding to 665240323 its reverse (323042566), we get a palindrome (988282889).

The spelling of 665240323 in words is "six hundred sixty-five million, two hundred forty thousand, three hundred twenty-three".