64543666164 has 12 divisors (see below), whose sum is σ = 150601887744. Its totient is φ = 21514555384.

The previous prime is 64543666163. The next prime is 64543666193. The reversal of 64543666164 is 46166634546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64543666163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2689319412 + ... + 2689319435.

It is an arithmetic number, because the mean of its divisors is an integer number (12550157312).

Almost surely, 2^64543666164 is an apocalyptic number.

It is an amenable number.

64543666164 is an abundant number, since it is smaller than the sum of its proper divisors (86058221580).

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

64543666164 is a wasteful number, since it uses less digits than its factorization.

64543666164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378638854 (or 5378638852 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 51.

The spelling of 64543666164 in words is "sixty-four billion, five hundred forty-three million, six hundred sixty-six thousand, one hundred sixty-four".