18080664681 has 8 divisors (see below), whose sum is σ = 24759108544. Its totient is φ = 11727998640.

The previous prime is 18080664673. The next prime is 18080664733. The reversal of 18080664681 is 18646608081.

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

It is not a de Polignac number, because 18080664681 - 2³ = 18080664673 is a prime.

It is a super-4 number, since 4×18080664681⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18080664681.

It is not an unprimeable number, because it can be changed into a prime (18080663681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81444325 + ... + 81444546.

It is an arithmetic number, because the mean of its divisors is an integer number (3094888568).

Almost surely, 2^18080664681 is an apocalyptic number.

It is an amenable number.

18080664681 is a deficient number, since it is larger than the sum of its proper divisors (6678443863).

18080664681 is a wasteful number, since it uses less digits than its factorization.

18080664681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162888911.

The product of its (nonzero) digits is 442368, while the sum is 48.

The spelling of 18080664681 in words is "eighteen billion, eighty million, six hundred sixty-four thousand, six hundred eighty-one".