18215365536 has 192 divisors, whose sum is σ = 55043936640. Its totient is φ = 5929604352.

The previous prime is 18215365529. The next prime is 18215365561. The reversal of 18215365536 is 63556351281.

18215365536 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 53 + 65 + 536 = 666.

It is a super-2 number, since 2×18215365536² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18215365491 and 18215365500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3006286 + ... + 3012338.

It is an arithmetic number, because the mean of its divisors is an integer number (286687170).

Almost surely, 2^18215365536 is an apocalyptic number.

18215365536 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 18215365536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27521968320).

18215365536 is an abundant number, since it is smaller than the sum of its proper divisors (36828571104).

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

18215365536 is an frugal number, since it uses more digits than its factorization.

18215365536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127 (or 6101 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 18215365536 in words is "eighteen billion, two hundred fifteen million, three hundred sixty-five thousand, five hundred thirty-six".