64000020664 has 16 divisors (see below), whose sum is σ = 120012228000. Its totient is φ = 31996759872.

The previous prime is 64000020661. The next prime is 64000020691. The reversal of 64000020664 is 46602000046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64000020661) 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, 321589 + ... + 481060.

It is an arithmetic number, because the mean of its divisors is an integer number (7500764250).

Almost surely, 2^64000020664 is an apocalyptic number.

It is an amenable number.

64000020664 is a deficient number, since it is larger than the sum of its proper divisors (56012207336).

64000020664 is a wasteful number, since it uses less digits than its factorization.

64000020664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812622 (or 812618 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 64000020664 in words is "sixty-four billion, twenty thousand, six hundred sixty-four".