18506478685868 has 24 divisors (see below), whose sum is σ = 32431408666272. Its totient is φ = 9240370020224.

The previous prime is 18506478685859. The next prime is 18506478685889. The reversal of 18506478685868 is 86858687460581.

It is a junction number, because it is equal to n+sod(n) for n = 18506478685792 and 18506478685801.

It is an unprimeable number.

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, 8147330 + ... + 10168182.

It is an arithmetic number, because the mean of its divisors is an integer number (1351308694428).

Almost surely, 2^{18506478685868} is an apocalyptic number.

It is an amenable number.

18506478685868 is a deficient number, since it is larger than the sum of its proper divisors (13924929980404).

18506478685868 is a wasteful number, since it uses less digits than its factorization.

18506478685868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024041 (or 2024039 counting only the distinct ones).

The product of its (nonzero) digits is 4954521600, while the sum is 80.

The spelling of 18506478685868 in words is "eighteen trillion, five hundred six billion, four hundred seventy-eight million, six hundred eighty-five thousand, eight hundred sixty-eight".