66686684356 has 12 divisors (see below), whose sum is σ = 116704537600. Its totient is φ = 33342530760.

The previous prime is 66686684353. The next prime is 66686684371. The reversal of 66686684356 is 65348668666.

It is a super-2 number, since 2×66686684356² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66686684353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5941 + ... + 365251.

Almost surely, 2^66686684356 is an apocalyptic number.

It is an amenable number.

66686684356 is a deficient number, since it is larger than the sum of its proper divisors (50017853244).

66686684356 is a wasteful number, since it uses less digits than its factorization.

66686684356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405714 (or 405712 counting only the distinct ones).

The product of its digits is 179159040, while the sum is 64.

The spelling of 66686684356 in words is "sixty-six billion, six hundred eighty-six million, six hundred eighty-four thousand, three hundred fifty-six".