18666868517 has 8 divisors (see below), whose sum is σ = 21249241920. Its totient is φ = 16232059360.

The previous prime is 18666868501. The next prime is 18666868523. The reversal of 18666868517 is 71586866681.

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

It is not a de Polignac number, because 18666868517 - 2⁴ = 18666868501 is a prime.

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 18666868517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18666865517) 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, 36890792 + ... + 36891297.

It is an arithmetic number, because the mean of its divisors is an integer number (2656155240).

Almost surely, 2^18666868517 is an apocalyptic number.

It is an amenable number.

18666868517 is a deficient number, since it is larger than the sum of its proper divisors (2582373403).

18666868517 is a wasteful number, since it uses less digits than its factorization.

18666868517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73782123.

The product of its digits is 23224320, while the sum is 62.

The spelling of 18666868517 in words is "eighteen billion, six hundred sixty-six million, eight hundred sixty-eight thousand, five hundred seventeen".