18181818187 has 6 divisors (see below), whose sum is σ = 19688004492. Its totient is φ = 16783216632.

The previous prime is 18181818119. The next prime is 18181818209. The reversal of 18181818187 is 78181818181.

It is not a de Polignac number, because 18181818187 - 2⁷ = 18181818059 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18181318187) 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, 53792193 + ... + 53792530.

It is an arithmetic number, because the mean of its divisors is an integer number (3281334082).

Almost surely, 2^18181818187 is an apocalyptic number.

18181818187 is a deficient number, since it is larger than the sum of its proper divisors (1506186305).

18181818187 is a wasteful number, since it uses less digits than its factorization.

18181818187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107584749 (or 107584736 counting only the distinct ones).

The product of its digits is 229376, while the sum is 52.

The spelling of 18181818187 in words is "eighteen billion, one hundred eighty-one million, eight hundred eighteen thousand, one hundred eighty-seven".