18861232188 has 48 divisors (see below), whose sum is σ = 44139270560. Its totient is φ = 6268575744.

The previous prime is 18861232183. The next prime is 18861232213. The reversal of 18861232188 is 88123216881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861232183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11139870 + ... + 11141562.

Almost surely, 2^18861232188 is an apocalyptic number.

It is an amenable number.

18861232188 is an abundant number, since it is smaller than the sum of its proper divisors (25278038372).

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

18861232188 is a wasteful number, since it uses less digits than its factorization.

18861232188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886 (or 3884 counting only the distinct ones).

The product of its digits is 294912, while the sum is 48.

The spelling of 18861232188 in words is "eighteen billion, eight hundred sixty-one million, two hundred thirty-two thousand, one hundred eighty-eight".