18872661164517 has 6 divisors (see below), whose sum is σ = 27260510570982. Its totient is φ = 12581774109672.

The previous prime is 18872661164503. The next prime is 18872661164527. The reversal of 18872661164517 is 71546116627881.

It is a happy number.

18872661164517 is a `hidden beast` number, since 1 + 8 + 8 + 7 + 2 + 6 + 611 + 6 + 4 + 5 + 1 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17952287636196 + 920373528321 = 4237014^2 + 959361^2 .

It is not a de Polignac number, because 18872661164517 - 2¹¹ = 18872661162469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18872661164527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1048481175798 + ... + 1048481175815.

It is an arithmetic number, because the mean of its divisors is an integer number (4543418428497).

Almost surely, 2^{18872661164517} is an apocalyptic number.

It is an amenable number.

18872661164517 is a deficient number, since it is larger than the sum of its proper divisors (8387849406465).

18872661164517 is a wasteful number, since it uses less digits than its factorization.

18872661164517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096962351619 (or 2096962351616 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The spelling of 18872661164517 in words is "eighteen trillion, eight hundred seventy-two billion, six hundred sixty-one million, one hundred sixty-four thousand, five hundred seventeen".