664164764732 has 12 divisors (see below), whose sum is σ = 1328329529520. Its totient is φ = 284642042016.

The previous prime is 664164764671. The next prime is 664164764773. The reversal of 664164764732 is 237467461466.

664164764732 is an admirable number.

It is a super-2 number, since 2×664164764732² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11860085057 + ... + 11860085112.

It is an arithmetic number, because the mean of its divisors is an integer number (110694127460).

Almost surely, 2^664164764732 is an apocalyptic number.

It is an amenable number.

664164764732 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

664164764732 is a wasteful number, since it uses less digits than its factorization.

664164764732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23720170180 (or 23720170178 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 56.

The spelling of 664164764732 in words is "six hundred sixty-four billion, one hundred sixty-four million, seven hundred sixty-four thousand, seven hundred thirty-two".