18739534608 has 120 divisors (see below), whose sum is σ = 52787996352. Its totient is φ = 6205780224.

The previous prime is 18739534607. The next prime is 18739534669. The reversal of 18739534608 is 80643593781.

18739534608 is a `hidden beast` number, since 18 + 7 + 39 + 534 + 60 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (18739534607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21222135 + ... + 21223017.

Almost surely, 2^18739534608 is an apocalyptic number.

18739534608 is a gapful number since it is divisible by the number (18) 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 18739534608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26393998176).

18739534608 is an abundant number, since it is smaller than the sum of its proper divisors (34048461744).

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

18739534608 is a wasteful number, since it uses less digits than its factorization.

18739534608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693 (or 1684 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 18739534608 in words is "eighteen billion, seven hundred thirty-nine million, five hundred thirty-four thousand, six hundred eight".