18344558616 has 24 divisors (see below), whose sum is σ = 45863055420. Its totient is φ = 6114631696.

The previous prime is 18344558599. The next prime is 18344558689. The reversal of 18344558616 is 61685544381.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 649705 + ... + 677351.

Almost surely, 2^18344558616 is an apocalyptic number.

It is an amenable number.

18344558616 is an abundant number, since it is smaller than the sum of its proper divisors (27518496804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18344558616 is an frugal number, since it uses more digits than its factorization.

18344558616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55303 (or 27652 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 51.

The spelling of 18344558616 in words is "eighteen billion, three hundred forty-four million, five hundred fifty-eight thousand, six hundred sixteen".