18539411616 has 288 divisors, whose sum is σ = 59658633216. Its totient is φ = 5410368000.

The previous prime is 18539411593. The next prime is 18539411651. The reversal of 18539411616 is 61611493581.

18539411616 is a `hidden beast` number, since 18 + 5 + 3 + 9 + 4 + 11 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30542385 + ... + 30542991.

It is an arithmetic number, because the mean of its divisors is an integer number (207148032).

Almost surely, 2^18539411616 is an apocalyptic number.

18539411616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18539411616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29829316608).

18539411616 is an abundant number, since it is smaller than the sum of its proper divisors (41119221600).

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

18539411616 is a wasteful number, since it uses less digits than its factorization.

18539411616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 965 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The spelling of 18539411616 in words is "eighteen billion, five hundred thirty-nine million, four hundred eleven thousand, six hundred sixteen".