18701717053517 has 4 divisors (see below), whose sum is σ = 18701966860896. Its totient is φ = 18701467246140.

The previous prime is 18701717053351. The next prime is 18701717053531. The reversal of 18701717053517 is 71535071710781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18701717053517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18701717053577) 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 3 ways as a sum of consecutive naturals, for example, 124791359 + ... + 124941132.

It is an arithmetic number, because the mean of its divisors is an integer number (4675491715224).

Almost surely, 2^{18701717053517} is an apocalyptic number.

It is an amenable number.

18701717053517 is a deficient number, since it is larger than the sum of its proper divisors (249807379).

18701717053517 is an equidigital number, since it uses as much as digits as its factorization.

18701717053517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249807378.

The product of its (nonzero) digits is 1440600, while the sum is 53.

The spelling of 18701717053517 in words is "eighteen trillion, seven hundred one billion, seven hundred seventeen million, fifty-three thousand, five hundred seventeen".