18549352512 has 196 divisors, whose sum is σ = 56539941276. Its totient is φ = 6031687680.

The previous prime is 18549352457. The next prime is 18549352531. The reversal of 18549352512 is 21525394581.

18549352512 is a `hidden beast` number, since 1 + 8 + 549 + 3 + 52 + 51 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1528497216 + 17020855296 = 39096^2 + 130464^2 .

It is a super-2 number, since 2×18549352512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1908048 + ... + 1917744.

Almost surely, 2^18549352512 is an apocalyptic number.

18549352512 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 18549352512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28269970638).

18549352512 is an abundant number, since it is smaller than the sum of its proper divisors (37990588764).

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

18549352512 is an frugal number, since it uses more digits than its factorization.

18549352512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9768 (or 9743 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The spelling of 18549352512 in words is "eighteen billion, five hundred forty-nine million, three hundred fifty-two thousand, five hundred twelve".