664674522338 has 18 divisors (see below), whose sum is σ = 1059140636193. Its totient is φ = 312778786720.

The previous prime is 664674522331. The next prime is 664674522349. The reversal of 664674522338 is 833225476466.

It can be written as a sum of positive squares in 2 ways, for example, as 608326682209 + 56347840129 = 779953^2 + 237377^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576487.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664674522331) 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 8 ways as a sum of consecutive naturals, for example, 19583603 + ... + 19617513.

Almost surely, 2^664674522338 is an apocalyptic number.

664674522338 is a deficient number, since it is larger than the sum of its proper divisors (394466113855).

664674522338 is an frugal number, since it uses more digits than its factorization.

664674522338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67858 (or 33930 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 56.

The spelling of 664674522338 in words is "six hundred sixty-four billion, six hundred seventy-four million, five hundred twenty-two thousand, three hundred thirty-eight".