665612323 has 4 divisors (see below), whose sum is σ = 665716968. Its totient is φ = 665507680.

The previous prime is 665612309. The next prime is 665612369. The reversal of 665612323 is 323216566.

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 665612323 - 2⁹ = 665611811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665613323) 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, 42118 + ... + 55723.

It is an arithmetic number, because the mean of its divisors is an integer number (166429242).

Almost surely, 2^665612323 is an apocalyptic number.

665612323 is a deficient number, since it is larger than the sum of its proper divisors (104645).

665612323 is an equidigital number, since it uses as much as digits as its factorization.

665612323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104644.

The product of its digits is 38880, while the sum is 34.

The square root of 665612323 is about 25799.4636184553. The cubic root of 665612323 is about 873.1196947307.

Adding to 665612323 its reverse (323216566), we get a palindrome (988828889).

The spelling of 665612323 in words is "six hundred sixty-five million, six hundred twelve thousand, three hundred twenty-three".