18381689814 has 8 divisors (see below), whose sum is σ = 36763379640. Its totient is φ = 6127229936.

The previous prime is 18381689813. The next prime is 18381689827. The reversal of 18381689814 is 41898618381.

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

18381689814 is an admirable number.

It is a super-2 number, since 2×18381689814² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381689813) 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 3 ways as a sum of consecutive naturals, for example, 1531807479 + ... + 1531807490.

It is an arithmetic number, because the mean of its divisors is an integer number (4595422455).

Almost surely, 2^18381689814 is an apocalyptic number.

18381689814 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18381689814 is a wasteful number, since it uses less digits than its factorization.

18381689814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063614974.

The product of its digits is 2654208, while the sum is 57.

The spelling of 18381689814 in words is "eighteen billion, three hundred eighty-one million, six hundred eighty-nine thousand, eight hundred fourteen".