18449913689 has 4 divisors (see below), whose sum is σ = 18657216180. Its totient is φ = 18242611200.

The previous prime is 18449913673. The next prime is 18449913787. The reversal of 18449913689 is 98631994481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9374112400 + 9075801289 = 96820^2 + 95267^2 .

It is a cyclic number.

It is not a de Polignac number, because 18449913689 - 2⁴ = 18449913673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18449913619) 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, 103651112 + ... + 103651289.

It is an arithmetic number, because the mean of its divisors is an integer number (4664304045).

Almost surely, 2^18449913689 is an apocalyptic number.

It is an amenable number.

18449913689 is a deficient number, since it is larger than the sum of its proper divisors (207302491).

18449913689 is an equidigital number, since it uses as much as digits as its factorization.

18449913689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207302490.

The product of its digits is 13436928, while the sum is 62.

The spelling of 18449913689 in words is "eighteen billion, four hundred forty-nine million, nine hundred thirteen thousand, six hundred eighty-nine".