66688659166869 has 24 divisors (see below), whose sum is σ = 99455677900800. Its totient is φ = 43016176012320.

The previous prime is 66688659166841. The next prime is 66688659166889. The reversal of 66688659166869 is 96866195688666.

It is a happy number.

It is not a de Polignac number, because 66688659166869 - 2¹² = 66688659162773 is a prime.

It is a super-2 number, since 2×66688659166869² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66688659166889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22976229 + ... + 25715450.

It is an arithmetic number, because the mean of its divisors is an integer number (4143986579200).

Almost surely, 2^{66688659166869} is an apocalyptic number.

It is an amenable number.

66688659166869 is a deficient number, since it is larger than the sum of its proper divisors (32767018733931).

66688659166869 is a wasteful number, since it uses less digits than its factorization.

66688659166869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48696625 (or 48696622 counting only the distinct ones).

The product of its digits is 58047528960, while the sum is 90.

The spelling of 66688659166869 in words is "sixty-six trillion, six hundred eighty-eight billion, six hundred fifty-nine million, one hundred sixty-six thousand, eight hundred sixty-nine".