18516681852 has 48 divisors (see below), whose sum is σ = 45197924352. Its totient is φ = 5888963520.

The previous prime is 18516681851. The next prime is 18516681863. The reversal of 18516681852 is 25818661581.

It is a super-2 number, since 2×18516681852² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18516681795 and 18516681804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18516681851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25077 + ... + 194067.

It is an arithmetic number, because the mean of its divisors is an integer number (941623424).

Almost surely, 2^18516681852 is an apocalyptic number.

18516681852 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 18516681852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22598962176).

18516681852 is an abundant number, since it is smaller than the sum of its proper divisors (26681242500).

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

18516681852 is a wasteful number, since it uses less digits than its factorization.

18516681852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169418 (or 169416 counting only the distinct ones).

The product of its digits is 921600, while the sum is 51.

The spelling of 18516681852 in words is "eighteen billion, five hundred sixteen million, six hundred eighty-one thousand, eight hundred fifty-two".