664636768688 has 20 divisors (see below), whose sum is σ = 1294270464960. Its totient is φ = 330631487424.

The previous prime is 664636768681. The next prime is 664636768703. The reversal of 664636768688 is 886867636466.

It is not an unprimeable number, because it can be changed into a prime (664636768681) 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, 105427808 + ... + 105434111.

It is an arithmetic number, because the mean of its divisors is an integer number (64713523248).

Almost surely, 2^664636768688 is an apocalyptic number.

It is an amenable number.

664636768688 is a deficient number, since it is larger than the sum of its proper divisors (629633696272).

664636768688 is a wasteful number, since it uses less digits than its factorization.

664636768688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210862124 (or 210862118 counting only the distinct ones).

The product of its digits is 2006581248, while the sum is 74.

The spelling of 664636768688 in words is "six hundred sixty-four billion, six hundred thirty-six million, seven hundred sixty-eight thousand, six hundred eighty-eight".