18122166500 has 48 divisors (see below), whose sum is σ = 39612308736. Its totient is φ = 7242732000.

The previous prime is 18122166479. The next prime is 18122166539. The reversal of 18122166500 is 566122181.

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 15 ways as a sum of consecutive naturals, for example, 600779 + ... + 630221.

It is an arithmetic number, because the mean of its divisors is an integer number (825256432).

Almost surely, 2^18122166500 is an apocalyptic number.

18122166500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18122166500 is an abundant number, since it is smaller than the sum of its proper divisors (21490142236).

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

18122166500 is a wasteful number, since it uses less digits than its factorization.

18122166500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30693 (or 30681 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

Adding to 18122166500 its reverse (566122181), we get a palindrome (18688288681).

The spelling of 18122166500 in words is "eighteen billion, one hundred twenty-two million, one hundred sixty-six thousand, five hundred".