18385263653 has 4 divisors (see below), whose sum is σ = 18812827968. Its totient is φ = 17957699340.

The previous prime is 18385263563. The next prime is 18385263679. The reversal of 18385263653 is 35636258381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18385263653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18385263553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213782093 + ... + 213782178.

It is an arithmetic number, because the mean of its divisors is an integer number (4703206992).

Almost surely, 2^18385263653 is an apocalyptic number.

It is an amenable number.

18385263653 is a deficient number, since it is larger than the sum of its proper divisors (427564315).

18385263653 is an equidigital number, since it uses as much as digits as its factorization.

18385263653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427564314.

The product of its digits is 3110400, while the sum is 50.

The spelling of 18385263653 in words is "eighteen billion, three hundred eighty-five million, two hundred sixty-three thousand, six hundred fifty-three".