18000322560 has 672 divisors, whose sum is σ = 71397376128. Its totient is φ = 4152360960.

The previous prime is 18000322559. The next prime is 18000322597. The reversal of 18000322560 is 6522300081.

18000322560 is a `hidden beast` number, since 1 + 80 + 0 + 0 + 3 + 22 + 560 = 666.

It is a super-2 number, since 2×18000322560² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93265824 + ... + 93266016.

Almost surely, 2^18000322560 is an apocalyptic number.

18000322560 is a gapful number since it is divisible by the number (10) 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 18000322560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35698688064).

18000322560 is an abundant number, since it is smaller than the sum of its proper divisors (53397053568).

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

18000322560 is a wasteful number, since it uses less digits than its factorization.

18000322560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 18000322560 in words is "eighteen billion, three hundred twenty-two thousand, five hundred sixty".