18667476681 has 16 divisors (see below), whose sum is σ = 28765296000. Its totient is φ = 10547273088.

The previous prime is 18667476679. The next prime is 18667476703.

18667476681 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18667476681 - 2¹ = 18667476679 is a prime.

It is a super-2 number, since 2×18667476681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18667476281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4992106 + ... + 4995843.

It is an arithmetic number, because the mean of its divisors is an integer number (1797831000).

Almost surely, 2^18667476681 is an apocalyptic number.

It is an amenable number.

18667476681 is a deficient number, since it is larger than the sum of its proper divisors (10097819319).

18667476681 is an equidigital number, since it uses as much as digits as its factorization.

18667476681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9988048.

The product of its digits is 16257024, while the sum is 60.

The spelling of 18667476681 in words is "eighteen billion, six hundred sixty-seven million, four hundred seventy-six thousand, six hundred eighty-one".