18666066681 has 32 divisors (see below), whose sum is σ = 28004352000. Its totient is φ = 12287071440.

The previous prime is 18666066631. The next prime is 18666066689.

18666066681 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-18666066681 is a prime.

It is a super-2 number, since 2×18666066681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18666066689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 710620 + ... + 736418.

It is an arithmetic number, because the mean of its divisors is an integer number (875136000).

Almost surely, 2^18666066681 is an apocalyptic number.

It is an amenable number.

18666066681 is a deficient number, since it is larger than the sum of its proper divisors (9338285319).

18666066681 is a wasteful number, since it uses less digits than its factorization.

18666066681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26146 (or 26140 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 18666066681 in words is "eighteen billion, six hundred sixty-six million, sixty-six thousand, six hundred eighty-one".