665113223 has 4 divisors (see below), whose sum is σ = 667383528. Its totient is φ = 662842920.

The previous prime is 665113213. The next prime is 665113249. The reversal of 665113223 is 322311566.

665113223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665113223 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 (665113213) 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, 1134713 + ... + 1135298.

It is an arithmetic number, because the mean of its divisors is an integer number (166845882).

Almost surely, 2^665113223 is an apocalyptic number.

665113223 is a deficient number, since it is larger than the sum of its proper divisors (2270305).

665113223 is a wasteful number, since it uses less digits than its factorization.

665113223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270304.

The product of its digits is 6480, while the sum is 29.

The square root of 665113223 is about 25789.7891228292. The cubic root of 665113223 is about 872.9014080045.

Adding to 665113223 its reverse (322311566), we get a palindrome (987424789).

The spelling of 665113223 in words is "six hundred sixty-five million, one hundred thirteen thousand, two hundred twenty-three".