18345636608 has 72 divisors (see below), whose sum is σ = 39992462496. Its totient is φ = 8347852800.

The previous prime is 18345636563. The next prime is 18345636613. The reversal of 18345636608 is 80663654381.

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 7 ways as a sum of consecutive naturals, for example, 197468 + ... + 275108.

It is an arithmetic number, because the mean of its divisors is an integer number (555450868).

Almost surely, 2^18345636608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18345636608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19996231248).

18345636608 is an abundant number, since it is smaller than the sum of its proper divisors (21646825888).

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

18345636608 is an equidigital number, since it uses as much as digits as its factorization.

18345636608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77741 (or 77727 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 18345636608 in words is "eighteen billion, three hundred forty-five million, six hundred thirty-six thousand, six hundred eight".