66505866176 has 14 divisors (see below), whose sum is σ = 131972578320. Its totient is φ = 33252933056.

The previous prime is 66505866169. The next prime is 66505866179. The reversal of 66505866176 is 67166850566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505866179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519577016 + ... + 519577143.

Almost surely, 2^66505866176 is an apocalyptic number.

It is an amenable number.

66505866176 is a deficient number, since it is larger than the sum of its proper divisors (65466712144).

66505866176 is a wasteful number, since it uses less digits than its factorization.

66505866176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039154171 (or 1039154161 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 66505866176 in words is "sixty-six billion, five hundred five million, eight hundred sixty-six thousand, one hundred seventy-six".