18808921859 has 16 divisors (see below), whose sum is σ = 23494963968. Its totient is φ = 14659663392.

The previous prime is 18808921823. The next prime is 18808921939. The reversal of 18808921859 is 95812980881.

It is a cyclic number.

It is not a de Polignac number, because 18808921859 - 2¹² = 18808917763 is a prime.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18808921798 and 18808921807.

It is not an unprimeable number, because it can be changed into a prime (18808921259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1536377 + ... + 1548570.

It is an arithmetic number, because the mean of its divisors is an integer number (1468435248).

Almost surely, 2^18808921859 is an apocalyptic number.

18808921859 is a deficient number, since it is larger than the sum of its proper divisors (4686042109).

18808921859 is a wasteful number, since it uses less digits than its factorization.

18808921859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3085034.

The product of its (nonzero) digits is 3317760, while the sum is 59.

The spelling of 18808921859 in words is "eighteen billion, eight hundred eight million, nine hundred twenty-one thousand, eight hundred fifty-nine".