18912087168 has 128 divisors (see below), whose sum is σ = 55845081600. Its totient is φ = 5631344640.

The previous prime is 18912087163. The next prime is 18912087193. The reversal of 18912087168 is 86178021981.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18912087168.

It is not an unprimeable number, because it can be changed into a prime (18912087163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93648 + ... + 215856.

It is an arithmetic number, because the mean of its divisors is an integer number (436289700).

Almost surely, 2^18912087168 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 18912087168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27922540800).

18912087168 is an abundant number, since it is smaller than the sum of its proper divisors (36932994432).

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

18912087168 is a wasteful number, since it uses less digits than its factorization.

18912087168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122270 (or 122258 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 51.

The spelling of 18912087168 in words is "eighteen billion, nine hundred twelve million, eighty-seven thousand, one hundred sixty-eight".