18685353852 has 108 divisors (see below), whose sum is σ = 51977059680. Its totient is φ = 5655640320.

The previous prime is 18685353829. The next prime is 18685353913. The reversal of 18685353852 is 25835358681.

It is a happy number.

18685353852 is a `hidden beast` number, since 1 + 8 + 6 + 8 + 53 + 538 + 52 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4802724 + ... + 4806612.

Almost surely, 2^18685353852 is an apocalyptic number.

18685353852 is a gapful number since it is divisible by the number (12) 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 18685353852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25988529840).

18685353852 is an abundant number, since it is smaller than the sum of its proper divisors (33291705828).

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

18685353852 is a wasteful number, since it uses less digits than its factorization.

18685353852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5024 (or 5008 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 54.

The spelling of 18685353852 in words is "eighteen billion, six hundred eighty-five million, three hundred fifty-three thousand, eight hundred fifty-two".