66684067788 has 48 divisors (see below), whose sum is σ = 167644342880. Its totient is φ = 20508470784.

The previous prime is 66684067759. The next prime is 66684067789. The reversal of 66684067788 is 88776048666.

It is not an unprimeable number, because it can be changed into a prime (66684067789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233358 + ... + 433386.

Almost surely, 2^66684067788 is an apocalyptic number.

It is an amenable number.

66684067788 is an abundant number, since it is smaller than the sum of its proper divisors (100960275092).

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

66684067788 is a wasteful number, since it uses less digits than its factorization.

66684067788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202186 (or 202184 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 66.

The spelling of 66684067788 in words is "sixty-six billion, six hundred eighty-four million, sixty-seven thousand, seven hundred eighty-eight".