18195103899 has 48 divisors (see below), whose sum is σ = 31798448640. Its totient is φ = 10250709840.

The previous prime is 18195103813. The next prime is 18195103907. The reversal of 18195103899 is 99830159181.

18195103899 is a `hidden beast` number, since 1 + 8 + 1 + 9 + 510 + 38 + 99 = 666.

It is not a de Polignac number, because 18195103899 - 2¹¹ = 18195101851 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18195103099) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2919 + ... + 190784.

It is an arithmetic number, because the mean of its divisors is an integer number (662467680).

Almost surely, 2^18195103899 is an apocalyptic number.

18195103899 is a deficient number, since it is larger than the sum of its proper divisors (13603344741).

18195103899 is a wasteful number, since it uses less digits than its factorization.

18195103899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193797 (or 193784 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 54.

The spelling of 18195103899 in words is "eighteen billion, one hundred ninety-five million, one hundred three thousand, eight hundred ninety-nine".