66908717184 has 32 divisors (see below), whose sum is σ = 177726281040. Its totient is φ = 22302905600.

The previous prime is 66908717153. The next prime is 66908717219. The reversal of 66908717184 is 48171780966.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

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, 87120342 + ... + 87121109.

Almost surely, 2^66908717184 is an apocalyptic number.

66908717184 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66908717184 is an abundant number, since it is smaller than the sum of its proper divisors (110817563856).

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

66908717184 is a wasteful number, since it uses less digits than its factorization.

66908717184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174241468 (or 174241456 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 66908717184 in words is "sixty-six billion, nine hundred eight million, seven hundred seventeen thousand, one hundred eighty-four".