18503199187 has 4 divisors (see below), whose sum is σ = 20185308216. Its totient is φ = 16821090160.

The previous prime is 18503199097. The next prime is 18503199203. The reversal of 18503199187 is 78199130581.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18503199187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18503169187) 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, 841054498 + ... + 841054519.

It is an arithmetic number, because the mean of its divisors is an integer number (5046327054).

Almost surely, 2^18503199187 is an apocalyptic number.

18503199187 is a deficient number, since it is larger than the sum of its proper divisors (1682109029).

18503199187 is a wasteful number, since it uses less digits than its factorization.

18503199187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682109028.

The product of its (nonzero) digits is 544320, while the sum is 52.

The spelling of 18503199187 in words is "eighteen billion, five hundred three million, one hundred ninety-nine thousand, one hundred eighty-seven".