664843254328 has 32 divisors (see below), whose sum is σ = 1359945592560. Its totient is φ = 302192826880.

The previous prime is 664843254319. The next prime is 664843254329. The reversal of 664843254328 is 823452348466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664843254329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3767526 + ... + 3940042.

Almost surely, 2^664843254328 is an apocalyptic number.

It is an amenable number.

664843254328 is an abundant number, since it is smaller than the sum of its proper divisors (695102338232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664843254328 is a wasteful number, since it uses less digits than its factorization.

664843254328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216327 (or 216323 counting only the distinct ones).

The product of its digits is 26542080, while the sum is 55.

The spelling of 664843254328 in words is "six hundred sixty-four billion, eight hundred forty-three million, two hundred fifty-four thousand, three hundred twenty-eight".