18003512385 has 40 divisors (see below), whose sum is σ = 32959656576. Its totient is φ = 9397568160.

The previous prime is 18003512383. The next prime is 18003512393. The reversal of 18003512385 is 58321530081.

It is not a de Polignac number, because 18003512385 - 2¹ = 18003512383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18003512383) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 453871 + ... + 491940.

Almost surely, 2^18003512385 is an apocalyptic number.

18003512385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18003512385 is a deficient number, since it is larger than the sum of its proper divisors (14956144191).

18003512385 is an equidigital number, since it uses as much as digits as its factorization.

18003512385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945875 (or 945866 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 18003512385 in words is "eighteen billion, three million, five hundred twelve thousand, three hundred eighty-five".