18459234649 has 4 divisors (see below), whose sum is σ = 18514010164. Its totient is φ = 18404459136.

The previous prime is 18459234641. The next prime is 18459234653. The reversal of 18459234649 is 94643295481.

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 12034090000 + 6425144649 = 109700^2 + 80157^2 .

It is a cyclic number.

It is not a de Polignac number, because 18459234649 - 2³ = 18459234641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18459234649.

It is not an unprimeable number, because it can be changed into a prime (18459234641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27387252 + ... + 27387925.

It is an arithmetic number, because the mean of its divisors is an integer number (4628502541).

Almost surely, 2^18459234649 is an apocalyptic number.

It is an amenable number.

18459234649 is a deficient number, since it is larger than the sum of its proper divisors (54775515).

18459234649 is an equidigital number, since it uses as much as digits as its factorization.

18459234649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54775514.

The product of its digits is 7464960, while the sum is 55.

The spelling of 18459234649 in words is "eighteen billion, four hundred fifty-nine million, two hundred thirty-four thousand, six hundred forty-nine".