18705385517 has 8 divisors (see below), whose sum is σ = 23022013056. Its totient is φ = 14799865392.

The previous prime is 18705385511. The next prime is 18705385561. The reversal of 18705385517 is 71558350781.

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

It is not a de Polignac number, because 18705385517 - 2²⁶ = 18638276653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705385511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102776753 + ... + 102776934.

It is an arithmetic number, because the mean of its divisors is an integer number (2877751632).

Almost surely, 2^18705385517 is an apocalyptic number.

It is an amenable number.

18705385517 is a deficient number, since it is larger than the sum of its proper divisors (4316627539).

18705385517 is a wasteful number, since it uses less digits than its factorization.

18705385517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205553707.

The product of its (nonzero) digits is 1176000, while the sum is 50.

The spelling of 18705385517 in words is "eighteen billion, seven hundred five million, three hundred eighty-five thousand, five hundred seventeen".