18015778218 has 16 divisors (see below), whose sum is σ = 36122320800. Its totient is φ = 5990132016.

The previous prime is 18015778181. The next prime is 18015778219. The reversal of 18015778218 is 81287751081.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18015778219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3779268 + ... + 3784031.

It is an arithmetic number, because the mean of its divisors is an integer number (2257645050).

Almost surely, 2^18015778218 is an apocalyptic number.

18015778218 is an abundant number, since it is smaller than the sum of its proper divisors (18106542582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18015778218 is a wasteful number, since it uses less digits than its factorization.

18015778218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7563701.

The product of its (nonzero) digits is 250880, while the sum is 48.

The spelling of 18015778218 in words is "eighteen billion, fifteen million, seven hundred seventy-eight thousand, two hundred eighteen".