18060860721 has 8 divisors (see below), whose sum is σ = 24535509120. Its totient is φ = 11813393072.

The previous prime is 18060860717. The next prime is 18060860767. The reversal of 18060860721 is 12706806081.

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 18060860721 - 2² = 18060860717 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18060860721.

It is not an unprimeable number, because it can be changed into a prime (18060860711) 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, 56795001 + ... + 56795318.

It is an arithmetic number, because the mean of its divisors is an integer number (3066938640).

Almost surely, 2^18060860721 is an apocalyptic number.

It is an amenable number.

18060860721 is a deficient number, since it is larger than the sum of its proper divisors (6474648399).

18060860721 is a wasteful number, since it uses less digits than its factorization.

18060860721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113590375.

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 18060860721 in words is "eighteen billion, sixty million, eight hundred sixty thousand, seven hundred twenty-one".