18668353686687 has 6 divisors (see below), whose sum is σ = 26965399769672. Its totient is φ = 12445569124452.

The previous prime is 18668353686617. The next prime is 18668353686727. The reversal of 18668353686687 is 78668635386681.

18668353686687 is a `hidden beast` number, since 18 + 6 + 6 + 8 + 3 + 536 + 8 + 6 + 68 + 7 = 666.

It is not a de Polignac number, because 18668353686687 - 2¹⁴ = 18668353670303 is a prime.

It is a super-2 number, since 2×18668353686687² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18668353686607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1037130760363 + ... + 1037130760380.

Almost surely, 2^{18668353686687} is an apocalyptic number.

18668353686687 is a deficient number, since it is larger than the sum of its proper divisors (8297046082985).

18668353686687 is a wasteful number, since it uses less digits than its factorization.

18668353686687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074261520749 (or 2074261520746 counting only the distinct ones).

The product of its digits is 10032906240, while the sum is 81.

The spelling of 18668353686687 in words is "eighteen trillion, six hundred sixty-eight billion, three hundred fifty-three million, six hundred eighty-six thousand, six hundred eighty-seven".