64475128664 has 8 divisors (see below), whose sum is σ = 120890866260. Its totient is φ = 32237564328.

The previous prime is 64475128631. The next prime is 64475128673. The reversal of 64475128664 is 46682157446.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4029695534 + ... + 4029695549.

Almost surely, 2^64475128664 is an apocalyptic number.

It is an amenable number.

64475128664 is a deficient number, since it is larger than the sum of its proper divisors (56415737596).

64475128664 is a wasteful number, since it uses less digits than its factorization.

64475128664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8059391089 (or 8059391085 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 53.

The spelling of 64475128664 in words is "sixty-four billion, four hundred seventy-five million, one hundred twenty-eight thousand, six hundred sixty-four".