18223205516 has 12 divisors (see below), whose sum is σ = 32752518288. Its totient is φ = 8865343152.

The previous prime is 18223205491. The next prime is 18223205531. The reversal of 18223205516 is 61550232281.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61564736 + ... + 61565031.

It is an arithmetic number, because the mean of its divisors is an integer number (2729376524).

Almost surely, 2^18223205516 is an apocalyptic number.

It is an amenable number.

18223205516 is a deficient number, since it is larger than the sum of its proper divisors (14529312772).

18223205516 is a wasteful number, since it uses less digits than its factorization.

18223205516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123129808 (or 123129806 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 18223205516 its reverse (61550232281), we get a palindrome (79773437797).

The spelling of 18223205516 in words is "eighteen billion, two hundred twenty-three million, two hundred five thousand, five hundred sixteen".