66731711904576 has 84 divisors (see below), whose sum is σ = 191341498387104. Its totient is φ = 22236101280000.

The previous prime is 66731711904541. The next prime is 66731711904577. The reversal of 66731711904576 is 67540911713766.

66731711904576 is a `hidden beast` number, since 6 + 6 + 7 + 3 + 171 + 1 + 9 + 0 + 457 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66731711904577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18675900 + ... + 21960251.

Almost surely, 2^{66731711904576} is an apocalyptic number.

It is an amenable number.

66731711904576 is an abundant number, since it is smaller than the sum of its proper divisors (124609786482528).

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

66731711904576 is a wasteful number, since it uses less digits than its factorization.

66731711904576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40639020 (or 40639007 counting only the distinct ones).

The product of its (nonzero) digits is 40007520, while the sum is 63.

The spelling of 66731711904576 in words is "sixty-six trillion, seven hundred thirty-one billion, seven hundred eleven million, nine hundred four thousand, five hundred seventy-six".