18243885913 has 12 divisors (see below), whose sum is σ = 20805373008. Its totient is φ = 15864243560.

The previous prime is 18243885901. The next prime is 18243885929. The reversal of 18243885913 is 31958834281.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-18243885913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18243885973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1561795 + ... + 1573432.

It is an arithmetic number, because the mean of its divisors is an integer number (1733781084).

Almost surely, 2^18243885913 is an apocalyptic number.

It is an amenable number.

18243885913 is a deficient number, since it is larger than the sum of its proper divisors (2561487095).

18243885913 is a wasteful number, since it uses less digits than its factorization.

18243885913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135284 (or 3135261 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The spelling of 18243885913 in words is "eighteen billion, two hundred forty-three million, eight hundred eighty-five thousand, nine hundred thirteen".