18668852220 has 48 divisors (see below), whose sum is σ = 52300432800. Its totient is φ = 4975727616.

The previous prime is 18668852183. The next prime is 18668852231. The reversal of 18668852220 is 2225886681.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18668852220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33456 + ... + 196104.

It is an arithmetic number, because the mean of its divisors is an integer number (1089592350).

Almost surely, 2^18668852220 is an apocalyptic number.

18668852220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18668852220 is an abundant number, since it is smaller than the sum of its proper divisors (33631580580).

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

18668852220 is a wasteful number, since it uses less digits than its factorization.

18668852220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164574 (or 164572 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 48.

The spelling of 18668852220 in words is "eighteen billion, six hundred sixty-eight million, eight hundred fifty-two thousand, two hundred twenty".