664234223 has 4 divisors (see below), whose sum is σ = 666501528. Its totient is φ = 661966920.

The previous prime is 664234199. The next prime is 664234229. The reversal of 664234223 is 322432466.

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 664234223 - 2¹⁸ = 663972079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664234223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664234229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1133213 + ... + 1133798.

It is an arithmetic number, because the mean of its divisors is an integer number (166625382).

Almost surely, 2^664234223 is an apocalyptic number.

664234223 is a deficient number, since it is larger than the sum of its proper divisors (2267305).

664234223 is a wasteful number, since it uses less digits than its factorization.

664234223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267304.

The product of its digits is 41472, while the sum is 32.

The square root of 664234223 is about 25772.7418603454. The cubic root of 664234223 is about 872.5167022799.

Adding to 664234223 its reverse (322432466), we get a palindrome (986666689).

The spelling of 664234223 in words is "six hundred sixty-four million, two hundred thirty-four thousand, two hundred twenty-three".