517871680687 has 8 divisors (see below), whose sum is σ = 520119909504. Its totient is φ = 515623671168.

The previous prime is 517871680673. The next prime is 517871680691. The reversal of 517871680687 is 786086178715.

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 517871680687 - 2¹⁹ = 517871156399 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 (517871680657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6238818 + ... + 6321280.

It is an arithmetic number, because the mean of its divisors is an integer number (65014988688).

Almost surely, 2^517871680687 is an apocalyptic number.

517871680687 is a deficient number, since it is larger than the sum of its proper divisors (2248228817).

517871680687 is a wasteful number, since it uses less digits than its factorization.

517871680687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109649.

The product of its (nonzero) digits is 31610880, while the sum is 64.

The spelling of 517871680687 in words is "five hundred seventeen billion, eight hundred seventy-one million, six hundred eighty thousand, six hundred eighty-seven".