18215806730 has 32 divisors (see below), whose sum is σ = 37651815360. Its totient is φ = 6275301120.

The previous prime is 18215806717. The next prime is 18215806747. The reversal of 18215806730 is 3760851281.

18215806730 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×18215806730² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4355759 + ... + 4359938.

It is an arithmetic number, because the mean of its divisors is an integer number (1176619230).

Almost surely, 2^18215806730 is an apocalyptic number.

18215806730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18215806730 is an abundant number, since it is smaller than the sum of its proper divisors (19436008630).

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

18215806730 is a wasteful number, since it uses less digits than its factorization.

18215806730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8715734.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 18215806730 in words is "eighteen billion, two hundred fifteen million, eight hundred six thousand, seven hundred thirty".