18385049993 has 16 divisors (see below), whose sum is σ = 19672338816. Its totient is φ = 17120920320.

The previous prime is 18385049957. The next prime is 18385050007. The reversal of 18385049993 is 39994058381.

It is not a de Polignac number, because 18385049993 - 2¹⁸ = 18384787849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18385049923) 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 15 ways as a sum of consecutive naturals, for example, 2414330 + ... + 2421932.

It is an arithmetic number, because the mean of its divisors is an integer number (1229521176).

Almost surely, 2^18385049993 is an apocalyptic number.

It is an amenable number.

18385049993 is a deficient number, since it is larger than the sum of its proper divisors (1287288823).

18385049993 is a wasteful number, since it uses less digits than its factorization.

18385049993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9104.

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 18385049993 in words is "eighteen billion, three hundred eighty-five million, forty-nine thousand, nine hundred ninety-three".