18218027520 has 1200 divisors, whose sum is σ = 83312890848. Its totient is φ = 3762339840.

The previous prime is 18218027501. The next prime is 18218027521. The reversal of 18218027520 is 2572081281.

18218027520 is a `hidden beast` number, since 18 + 21 + 80 + 27 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18218027521) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 111766959 + ... + 111767121.

Almost surely, 2^18218027520 is an apocalyptic number.

18218027520 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 18218027520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41656445424).

18218027520 is an abundant number, since it is smaller than the sum of its proper divisors (65094863328).

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

18218027520 is a wasteful number, since it uses less digits than its factorization.

18218027520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The spelling of 18218027520 in words is "eighteen billion, two hundred eighteen million, twenty-seven thousand, five hundred twenty".