18347388681 has 8 divisors (see below), whose sum is σ = 24464119680. Its totient is φ = 12231125072.

The previous prime is 18347388679. The next prime is 18347388743. The reversal of 18347388681 is 18688374381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18347388681 - 2¹ = 18347388679 is a prime.

It is a super-2 number, since 2×18347388681² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18347388641) 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 7 ways as a sum of consecutive naturals, for example, 11745 + ... + 191918.

It is an arithmetic number, because the mean of its divisors is an integer number (3058014960).

Almost surely, 2^18347388681 is an apocalyptic number.

It is an amenable number.

18347388681 is a deficient number, since it is larger than the sum of its proper divisors (6116730999).

18347388681 is a wasteful number, since it uses less digits than its factorization.

18347388681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233695.

The product of its digits is 6193152, while the sum is 57.

The spelling of 18347388681 in words is "eighteen billion, three hundred forty-seven million, three hundred eighty-eight thousand, six hundred eighty-one".