18386722049 has 4 divisors (see below), whose sum is σ = 18392856000. Its totient is φ = 18380588100.

The previous prime is 18386722027. The next prime is 18386722069. The reversal of 18386722049 is 94022768381.

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 not a de Polignac number, because 18386722049 - 2²⁰ = 18385673473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18386721988 and 18386722006.

It is not an unprimeable number, because it can be changed into a prime (18386722019) 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, 3062477 + ... + 3068474.

It is an arithmetic number, because the mean of its divisors is an integer number (4598214000).

Almost surely, 2^18386722049 is an apocalyptic number.

It is an amenable number.

18386722049 is a deficient number, since it is larger than the sum of its proper divisors (6133951).

18386722049 is an equidigital number, since it uses as much as digits as its factorization.

18386722049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6133950.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 18386722049 in words is "eighteen billion, three hundred eighty-six million, seven hundred twenty-two thousand, forty-nine".