66668532608 has 64 divisors (see below), whose sum is σ = 133520199120. Its totient is φ = 33158062080.

The previous prime is 66668532577. The next prime is 66668532653. The reversal of 66668532608 is 80623586666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23301098 + ... + 23303958.

Almost surely, 2^66668532608 is an apocalyptic number.

It is an amenable number.

66668532608 is an abundant number, since it is smaller than the sum of its proper divisors (66851666512).

66668532608 is a wasteful number, since it uses less digits than its factorization.

66668532608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3775 (or 3763 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 66668532608 in words is "sixty-six billion, six hundred sixty-eight million, five hundred thirty-two thousand, six hundred eight".