18008668356 has 144 divisors (see below), whose sum is σ = 50697642240. Its totient is φ = 4955005440.

The previous prime is 18008668339. The next prime is 18008668357. The reversal of 18008668356 is 65386680081.

It is a junction number, because it is equal to n+sod(n) for n = 18008668299 and 18008668308.

It is not an unprimeable number, because it can be changed into a prime (18008668357) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7893936 + ... + 7896216.

It is an arithmetic number, because the mean of its divisors is an integer number (352066960).

Almost surely, 2^18008668356 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 18008668356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25348821120).

18008668356 is an abundant number, since it is smaller than the sum of its proper divisors (32688973884).

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

18008668356 is a wasteful number, since it uses less digits than its factorization.

18008668356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 18008668356 in words is "eighteen billion, eight million, six hundred sixty-eight thousand, three hundred fifty-six".