18998118568 has 128 divisors (see below), whose sum is σ = 43302672000. Its totient is φ = 7697617920.

The previous prime is 18998118541. The next prime is 18998118577. The reversal of 18998118568 is 86581189981.

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, 5881978 + ... + 5885206.

It is an arithmetic number, because the mean of its divisors is an integer number (338302125).

Almost surely, 2^18998118568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18998118568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21651336000).

18998118568 is an abundant number, since it is smaller than the sum of its proper divisors (24304553432).

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

18998118568 is a wasteful number, since it uses less digits than its factorization.

18998118568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3435 (or 3431 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 64.

The spelling of 18998118568 in words is "eighteen billion, nine hundred ninety-eight million, one hundred eighteen thousand, five hundred sixty-eight".