18198427887 has 12 divisors (see below), whose sum is σ = 26291012904. Its totient is φ = 12130256880.

The previous prime is 18198427883. The next prime is 18198427889. The reversal of 18198427887 is 78872489181.

18198427887 is a `hidden beast` number, since 18 + 198 + 427 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 18198427887 - 2² = 18198427883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198427883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111168 + ... + 220805.

It is an arithmetic number, because the mean of its divisors is an integer number (2190917742).

Almost surely, 2^18198427887 is an apocalyptic number.

18198427887 is a deficient number, since it is larger than the sum of its proper divisors (8092585017).

18198427887 is a wasteful number, since it uses less digits than its factorization.

18198427887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338070 (or 338067 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 63.

The spelling of 18198427887 in words is "eighteen billion, one hundred ninety-eight million, four hundred twenty-seven thousand, eight hundred eighty-seven".