18021880511668 has 24 divisors (see below), whose sum is σ = 34406380207584. Its totient is φ = 8191532450400.

The previous prime is 18021880511647. The next prime is 18021880511669. The reversal of 18021880511668 is 86611508812081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021880511669) 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 7 ways as a sum of consecutive naturals, for example, 4205403 + ... + 7330018.

It is an arithmetic number, because the mean of its divisors is an integer number (1433599175316).

Almost surely, 2^{18021880511668} is an apocalyptic number.

It is an amenable number.

18021880511668 is a deficient number, since it is larger than the sum of its proper divisors (16384499695916).

18021880511668 is a wasteful number, since it uses less digits than its factorization.

18021880511668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11570943 (or 11570941 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 55.

The spelling of 18021880511668 in words is "eighteen trillion, twenty-one billion, eight hundred eighty million, five hundred eleven thousand, six hundred sixty-eight".