18804905523 has 6 divisors (see below), whose sum is σ = 27162641324. Its totient is φ = 12536603676.

The previous prime is 18804905513. The next prime is 18804905557. The reversal of 18804905523 is 32550940881.

18804905523 is a `hidden beast` number, since 1 + 8 + 8 + 0 + 4 + 90 + 552 + 3 = 666.

It is not a de Polignac number, because 18804905523 - 2⁸ = 18804905267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18804905513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1044716965 + ... + 1044716982.

Almost surely, 2^18804905523 is an apocalyptic number.

18804905523 is a deficient number, since it is larger than the sum of its proper divisors (8357735801).

18804905523 is a wasteful number, since it uses less digits than its factorization.

18804905523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089433953 (or 2089433950 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 18804905523 in words is "eighteen billion, eight hundred four million, nine hundred five thousand, five hundred twenty-three".