18685839456 has 120 divisors (see below), whose sum is σ = 56440082160. Its totient is φ = 6060241152.

The previous prime is 18685839413. The next prime is 18685839461. The reversal of 18685839456 is 65493858681.

18685839456 is a `hidden beast` number, since 1 + 8 + 6 + 8 + 583 + 9 + 45 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18685839393 and 18685839402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1516 + ... + 193323.

It is an arithmetic number, because the mean of its divisors is an integer number (470334018).

Almost surely, 2^18685839456 is an apocalyptic number.

18685839456 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 18685839456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28220041080).

18685839456 is an abundant number, since it is smaller than the sum of its proper divisors (37754242704).

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

18685839456 is a wasteful number, since it uses less digits than its factorization.

18685839456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194898 (or 194881 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 63.

The spelling of 18685839456 in words is "eighteen billion, six hundred eighty-five million, eight hundred thirty-nine thousand, four hundred fifty-six".