3686686866864 has 80 divisors (see below), whose sum is σ = 10641275164800. Its totient is φ = 1222030257984.

The previous prime is 3686686866823. The next prime is 3686686866887. The reversal of 3686686866864 is 4686686866863.

3686686866864 is a `hidden beast` number, since 368 + 6 + 68 + 6 + 86 + 68 + 64 = 666.

It is a super-2 number, since 2×3686686866864² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (81) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23760654 + ... + 23915309.

It is an arithmetic number, because the mean of its divisors is an integer number (133015939560).

Almost surely, 2^{3686686866864} is an apocalyptic number.

It is an amenable number.

3686686866864 is an abundant number, since it is smaller than the sum of its proper divisors (6954588297936).

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

3686686866864 is a wasteful number, since it uses less digits than its factorization.

3686686866864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47676159 (or 47676147 counting only the distinct ones).

The product of its digits is 13759414272, while the sum is 81.

Subtracting 3686686866864 from its reverse (4686686866863), we obtain a palindrome (999999999999).

The spelling of 3686686866864 in words is "three trillion, six hundred eighty-six billion, six hundred eighty-six million, eight hundred sixty-six thousand, eight hundred sixty-four".