18660866899552 has 48 divisors (see below), whose sum is σ = 37011160630080. Its totient is φ = 9261223308288.

The previous prime is 18660866899403. The next prime is 18660866899573. The reversal of 18660866899552 is 25599866806681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37132774 + ... + 37631962.

It is an arithmetic number, because the mean of its divisors is an integer number (771065846460).

Almost surely, 2^{18660866899552} is an apocalyptic number.

It is an amenable number.

18660866899552 is a deficient number, since it is larger than the sum of its proper divisors (18350293730528).

18660866899552 is a wasteful number, since it uses less digits than its factorization.

18660866899552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507863 (or 507855 counting only the distinct ones).

The product of its (nonzero) digits is 2687385600, while the sum is 79.

The spelling of 18660866899552 in words is "eighteen trillion, six hundred sixty billion, eight hundred sixty-six million, eight hundred ninety-nine thousand, five hundred fifty-two".