18881530668 has 864 divisors, whose sum is σ = 71572300800. Its totient is φ = 4064670720.

The previous prime is 18881530589. The next prime is 18881530727. The reversal of 18881530668 is 86603518881.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 173224998 + ... + 173225106.

Almost surely, 2^18881530668 is an apocalyptic number.

18881530668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18881530668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35786150400).

18881530668 is an abundant number, since it is smaller than the sum of its proper divisors (52690770132).

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

18881530668 is a wasteful number, since it uses less digits than its factorization.

18881530668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 54.

The spelling of 18881530668 in words is "eighteen billion, eight hundred eighty-one million, five hundred thirty thousand, six hundred sixty-eight".