18065890081 has 8 divisors (see below), whose sum is σ = 18412738560. Its totient is φ = 17722238688.

The previous prime is 18065890079. The next prime is 18065890091. The reversal of 18065890081 is 18009856081.

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 18065890081 - 2¹ = 18065890079 is a prime.

It is a super-2 number, since 2×18065890081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18065890001) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 787861 + ... + 810466.

It is an arithmetic number, because the mean of its divisors is an integer number (2301592320).

Almost surely, 2^18065890081 is an apocalyptic number.

It is an amenable number.

18065890081 is a deficient number, since it is larger than the sum of its proper divisors (346848479).

18065890081 is a wasteful number, since it uses less digits than its factorization.

18065890081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598543.

The product of its (nonzero) digits is 138240, while the sum is 46.

The spelling of 18065890081 in words is "eighteen billion, sixty-five million, eight hundred ninety thousand, eighty-one".