18205939106783 has 4 divisors (see below), whose sum is σ = 18208425924528. Its totient is φ = 18203452289040.

The previous prime is 18205939106741. The next prime is 18205939106791. The reversal of 18205939106783 is 38760193950281.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18205939106783 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 (18205939109783) 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, 1243397891 + ... + 1243412532.

It is an arithmetic number, because the mean of its divisors is an integer number (4552106481132).

Almost surely, 2^{18205939106783} is an apocalyptic number.

18205939106783 is a deficient number, since it is larger than the sum of its proper divisors (2486817745).

18205939106783 is an equidigital number, since it uses as much as digits as its factorization.

18205939106783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486817744.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 18205939106783 in words is "eighteen trillion, two hundred five billion, nine hundred thirty-nine million, one hundred six thousand, seven hundred eighty-three".