18117335680 has 128 divisors (see below), whose sum is σ = 43787278080. Its totient is φ = 7167885312.

The previous prime is 18117335651. The next prime is 18117335707. The reversal of 18117335680 is 8653371181.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36018309 + ... + 36018811.

It is an arithmetic number, because the mean of its divisors is an integer number (342088110).

Almost surely, 2^18117335680 is an apocalyptic number.

18117335680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18117335680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21893639040).

18117335680 is an abundant number, since it is smaller than the sum of its proper divisors (25669942400).

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

18117335680 is a wasteful number, since it uses less digits than its factorization.

18117335680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 18117335680 in words is "eighteen billion, one hundred seventeen million, three hundred thirty-five thousand, six hundred eighty".