18181680272 has 20 divisors (see below), whose sum is σ = 40259435136. Its totient is φ = 7792148640.

The previous prime is 18181680259. The next prime is 18181680289. The reversal of 18181680272 is 27208618181.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81168104 + ... + 81168327.

Almost surely, 2^18181680272 is an apocalyptic number.

It is an amenable number.

18181680272 is an abundant number, since it is smaller than the sum of its proper divisors (22077754864).

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

18181680272 is a wasteful number, since it uses less digits than its factorization.

18181680272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162336446 (or 162336440 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 44.

The spelling of 18181680272 in words is "eighteen billion, one hundred eighty-one million, six hundred eighty thousand, two hundred seventy-two".