18686868681 has 16 divisors (see below), whose sum is σ = 26907189120. Its totient is φ = 11467570560.

The previous prime is 18686868679. The next prime is 18686868691.

18686868681 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18686868681 - 2¹ = 18686868679 is a prime.

It is a super-2 number, since 2×18686868681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18686868671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653340 + ... + 681341.

It is an arithmetic number, because the mean of its divisors is an integer number (1681699320).

Almost surely, 2^18686868681 is an apocalyptic number.

It is an amenable number.

18686868681 is a deficient number, since it is larger than the sum of its proper divisors (8220320439).

18686868681 is a wasteful number, since it uses less digits than its factorization.

18686868681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335056.

The product of its digits is 42467328, while the sum is 66.

The spelling of 18686868681 in words is "eighteen billion, six hundred eighty-six million, eight hundred sixty-eight thousand, six hundred eighty-one".