664521322 has 8 divisors (see below), whose sum is σ = 997004736. Its totient is φ = 332186412.

The previous prime is 664521293. The next prime is 664521329. The reversal of 664521322 is 223125466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (664521329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25168 + ... + 44299.

It is an arithmetic number, because the mean of its divisors is an integer number (124625592).

Almost surely, 2^664521322 is an apocalyptic number.

664521322 is a deficient number, since it is larger than the sum of its proper divisors (332483414).

664521322 is a wasteful number, since it uses less digits than its factorization.

664521322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74252.

The product of its digits is 17280, while the sum is 31.

The square root of 664521322 is about 25778.3110773379. The cubic root of 664521322 is about 872.6423921756.

Adding to 664521322 its reverse (223125466), we get a palindrome (887646788).

The spelling of 664521322 in words is "six hundred sixty-four million, five hundred twenty-one thousand, three hundred twenty-two".