18563038856 has 8 divisors (see below), whose sum is σ = 34805697870. Its totient is φ = 9281519424.

The previous prime is 18563038801. The next prime is 18563038867. The reversal of 18563038856 is 65883036581.

It can be written as a sum of positive squares in only one way, i.e., 15467896900 + 3095141956 = 124370^2 + 55634^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18563038798 and 18563038807.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1160189921 + ... + 1160189936.

Almost surely, 2^18563038856 is an apocalyptic number.

It is an amenable number.

18563038856 is a deficient number, since it is larger than the sum of its proper divisors (16242659014).

18563038856 is a wasteful number, since it uses less digits than its factorization.

18563038856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320379863 (or 2320379859 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 18563038856 in words is "eighteen billion, five hundred sixty-three million, thirty-eight thousand, eight hundred fifty-six".