18918045258 has 64 divisors (see below), whose sum is σ = 44322647040. Its totient is φ = 5270140800.

The previous prime is 18918045221. The next prime is 18918045271. The reversal of 18918045258 is 85254081981.

It is a self number, because there is not a number n which added to its sum of digits gives 18918045258.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5610313 + ... + 5613683.

It is an arithmetic number, because the mean of its divisors is an integer number (692541360).

Almost surely, 2^18918045258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18918045258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22161323520).

18918045258 is an abundant number, since it is smaller than the sum of its proper divisors (25404601782).

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

18918045258 is a wasteful number, since it uses less digits than its factorization.

18918045258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6683.

The product of its (nonzero) digits is 921600, while the sum is 51.

The spelling of 18918045258 in words is "eighteen billion, nine hundred eighteen million, forty-five thousand, two hundred fifty-eight".