18353666847 has 4 divisors (see below), whose sum is σ = 24471555800. Its totient is φ = 12235777896.

The previous prime is 18353666843. The next prime is 18353666857. The reversal of 18353666847 is 74866635381.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18353666847 - 2² = 18353666843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18353666843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3058944472 + ... + 3058944477.

It is an arithmetic number, because the mean of its divisors is an integer number (6117888950).

Almost surely, 2^18353666847 is an apocalyptic number.

18353666847 is a deficient number, since it is larger than the sum of its proper divisors (6117888953).

18353666847 is an equidigital number, since it uses as much as digits as its factorization.

18353666847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6117888952.

The product of its digits is 17418240, while the sum is 57.

The spelling of 18353666847 in words is "eighteen billion, three hundred fifty-three million, six hundred sixty-six thousand, eight hundred forty-seven".