18383850681 has 8 divisors (see below), whose sum is σ = 28013486784. Its totient is φ = 10505057520.

The previous prime is 18383850679. The next prime is 18383850713. The reversal of 18383850681 is 18605838381.

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

It is not a de Polignac number, because 18383850681 - 2¹ = 18383850679 is a prime.

It is a super-2 number, since 2×18383850681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18383850281) 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, 437710710 + ... + 437710751.

It is an arithmetic number, because the mean of its divisors is an integer number (3501685848).

Almost surely, 2^18383850681 is an apocalyptic number.

It is an amenable number.

18383850681 is a deficient number, since it is larger than the sum of its proper divisors (9629636103).

18383850681 is an equidigital number, since it uses as much as digits as its factorization.

18383850681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875421471.

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 18383850681 in words is "eighteen billion, three hundred eighty-three million, eight hundred fifty thousand, six hundred eighty-one".