18351850168517 has 8 divisors (see below), whose sum is σ = 18547050376440. Its totient is φ = 18156914641600.

The previous prime is 18351850168507. The next prime is 18351850168523. The reversal of 18351850168517 is 71586105815381.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11595754804516 + 6756095364001 = 3405254^2 + 2599249^2 .

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 18351850168517 - 2¹⁰ = 18351850167493 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 (18351850168507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66030842 + ... + 66308187.

It is an arithmetic number, because the mean of its divisors is an integer number (2318381297055).

Almost surely, 2^{18351850168517} is an apocalyptic number.

It is an amenable number.

18351850168517 is a deficient number, since it is larger than the sum of its proper divisors (195200207923).

18351850168517 is a wasteful number, since it uses less digits than its factorization.

18351850168517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132340503.

The product of its (nonzero) digits is 8064000, while the sum is 59.

The spelling of 18351850168517 in words is "eighteen trillion, three hundred fifty-one billion, eight hundred fifty million, one hundred sixty-eight thousand, five hundred seventeen".