18581996161 has 8 divisors (see below), whose sum is σ = 19357395200. Its totient is φ = 17817595920.

The previous prime is 18581996141. The next prime is 18581996177. The reversal of 18581996161 is 16169918581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18581996161 - 2⁵ = 18581996129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18581996131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2746251 + ... + 2753008.

It is an arithmetic number, because the mean of its divisors is an integer number (2419674400).

Almost surely, 2^18581996161 is an apocalyptic number.

It is an amenable number.

18581996161 is a deficient number, since it is larger than the sum of its proper divisors (775399039).

18581996161 is a wasteful number, since it uses less digits than its factorization.

18581996161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499399.

The product of its digits is 933120, while the sum is 55.

The spelling of 18581996161 in words is "eighteen billion, five hundred eighty-one million, nine hundred ninety-six thousand, one hundred sixty-one".