18081657168 has 40 divisors (see below), whose sum is σ = 46736467008. Its totient is φ = 6023926272.

The previous prime is 18081657089. The next prime is 18081657221. The reversal of 18081657168 is 86175618081.

It is a self number, because there is not a number n which added to its sum of digits gives 18081657168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13321 + ... + 190632.

Almost surely, 2^18081657168 is an apocalyptic number.

It is an amenable number.

18081657168 is an abundant number, since it is smaller than the sum of its proper divisors (28654809840).

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

18081657168 is a wasteful number, since it uses less digits than its factorization.

18081657168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205811 (or 205805 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 51.

The spelling of 18081657168 in words is "eighteen billion, eighty-one million, six hundred fifty-seven thousand, one hundred sixty-eight".