18815094999 has 6 divisors (see below), whose sum is σ = 27177359456. Its totient is φ = 12543396660.

The previous prime is 18815094973. The next prime is 18815095009. The reversal of 18815094999 is 99949051881.

18815094999 is a `hidden beast` number, since 1 + 8 + 81 + 509 + 49 + 9 + 9 = 666.

It is not a de Polignac number, because 18815094999 - 2⁷ = 18815094871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18815094799) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1045283047 + ... + 1045283064.

Almost surely, 2^18815094999 is an apocalyptic number.

18815094999 is a deficient number, since it is larger than the sum of its proper divisors (8362264457).

18815094999 is a wasteful number, since it uses less digits than its factorization.

18815094999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090566117 (or 2090566114 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 63.

The spelling of 18815094999 in words is "eighteen billion, eight hundred fifteen million, ninety-four thousand, nine hundred ninety-nine".