18522712656 has 180 divisors, whose sum is σ = 60384602772. Its totient is φ = 5284887552.

The previous prime is 18522712651. The next prime is 18522712669. The reversal of 18522712656 is 65621722581.

18522712656 is a `hidden beast` number, since 1 + 8 + 522 + 71 + 2 + 6 + 56 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9576579600 + 8946133056 = 97860^2 + 94584^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18522712651) 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, 7033516 + ... + 7036148.

Almost surely, 2^18522712656 is an apocalyptic number.

18522712656 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 18522712656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30192301386).

18522712656 is an abundant number, since it is smaller than the sum of its proper divisors (41861890116).

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

18522712656 is a wasteful number, since it uses less digits than its factorization.

18522712656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658 (or 3642 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 18522712656 in words is "eighteen billion, five hundred twenty-two million, seven hundred twelve thousand, six hundred fifty-six".