18219158988 has 12 divisors (see below), whose sum is σ = 42511371000. Its totient is φ = 6073052992.

The previous prime is 18219158987. The next prime is 18219159083. The reversal of 18219158988 is 88985191281.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18219158987) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 759131613 + ... + 759131636.

It is an arithmetic number, because the mean of its divisors is an integer number (3542614250).

Almost surely, 2^18219158988 is an apocalyptic number.

It is an amenable number.

18219158988 is an abundant number, since it is smaller than the sum of its proper divisors (24292212012).

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

18219158988 is a wasteful number, since it uses less digits than its factorization.

18219158988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518263256 (or 1518263254 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 60.

The spelling of 18219158988 in words is "eighteen billion, two hundred nineteen million, one hundred fifty-eight thousand, nine hundred eighty-eight".