18383378847 has 4 divisors (see below), whose sum is σ = 24511171800. Its totient is φ = 12255585896.

The previous prime is 18383378833. The next prime is 18383378857. The reversal of 18383378847 is 74887338381.

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

It is a cyclic number.

It is not a de Polignac number, because 18383378847 - 2¹¹ = 18383376799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18383378857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3063896472 + ... + 3063896477.

It is an arithmetic number, because the mean of its divisors is an integer number (6127792950).

Almost surely, 2^18383378847 is an apocalyptic number.

18383378847 is a deficient number, since it is larger than the sum of its proper divisors (6127792953).

18383378847 is an equidigital number, since it uses as much as digits as its factorization.

18383378847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127792952.

The product of its digits is 21676032, while the sum is 60.

The spelling of 18383378847 in words is "eighteen billion, three hundred eighty-three million, three hundred seventy-eight thousand, eight hundred forty-seven".