18966320918663 has 8 divisors (see below), whose sum is σ = 18993888220800. Its totient is φ = 18938773575288.

The previous prime is 18966320918639. The next prime is 18966320918717. The reversal of 18966320918663 is 36681902366981.

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 18966320918663 - 2¹⁴ = 18966320902279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18966320918593 and 18966320918602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18966320918063) 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, 3087233 + ... + 6889386.

It is an arithmetic number, because the mean of its divisors is an integer number (2374236027600).

Almost surely, 2^{18966320918663} is an apocalyptic number.

18966320918663 is a deficient number, since it is larger than the sum of its proper divisors (27567302137).

18966320918663 is a wasteful number, since it uses less digits than its factorization.

18966320918663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9979381.

The product of its (nonzero) digits is 120932352, while the sum is 68.

The spelling of 18966320918663 in words is "eighteen trillion, nine hundred sixty-six billion, three hundred twenty million, nine hundred eighteen thousand, six hundred sixty-three".