517881334721 has 8 divisors (see below), whose sum is σ = 518225760000. Its totient is φ = 517536986400.

The previous prime is 517881334613. The next prime is 517881334727. The reversal of 517881334721 is 127433188715.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-517881334721 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 517881334721.

It is not an unprimeable number, because it can be changed into a prime (517881334727) 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, 19906280 + ... + 19932278.

It is an arithmetic number, because the mean of its divisors is an integer number (64778220000).

Almost surely, 2^517881334721 is an apocalyptic number.

It is an amenable number.

517881334721 is a deficient number, since it is larger than the sum of its proper divisors (344425279).

517881334721 is a wasteful number, since it uses less digits than its factorization.

517881334721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38479.

The product of its digits is 1128960, while the sum is 50.

The spelling of 517881334721 in words is "five hundred seventeen billion, eight hundred eighty-one million, three hundred thirty-four thousand, seven hundred twenty-one".