18516471732 has 108 divisors (see below), whose sum is σ = 51507221220. Its totient is φ = 5604529920.

The previous prime is 18516471731. The next prime is 18516471863. The reversal of 18516471732 is 23717461581.

It can be written as a sum of positive squares in 2 ways, for example, as 1679852196 + 16836619536 = 40986^2 + 129756^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18516471731) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4828888 + ... + 4832720.

It is an arithmetic number, because the mean of its divisors is an integer number (476918715).

Almost surely, 2^18516471732 is an apocalyptic number.

18516471732 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 18516471732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25753610610).

18516471732 is an abundant number, since it is smaller than the sum of its proper divisors (32990749488).

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

18516471732 is a wasteful number, since it uses less digits than its factorization.

18516471732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974 (or 4958 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 18516471732 in words is "eighteen billion, five hundred sixteen million, four hundred seventy-one thousand, seven hundred thirty-two".