664930321 has 4 divisors (see below), whose sum is σ = 725378544. Its totient is φ = 604482100.

The previous prime is 664930313. The next prime is 664930337. The reversal of 664930321 is 123039466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664930321 - 2³ = 664930313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664930121) 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, 30224095 + ... + 30224116.

It is an arithmetic number, because the mean of its divisors is an integer number (181344636).

Almost surely, 2^664930321 is an apocalyptic number.

It is an amenable number.

664930321 is a deficient number, since it is larger than the sum of its proper divisors (60448223).

664930321 is a wasteful number, since it uses less digits than its factorization.

664930321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60448222.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 664930321 is about 25786.2428632013. The cubic root of 664930321 is about 872.8213865161.

Adding to 664930321 its reverse (123039466), we get a palindrome (787969787).

The spelling of 664930321 in words is "six hundred sixty-four million, nine hundred thirty thousand, three hundred twenty-one".