517638131720 has 64 divisors (see below), whose sum is σ = 1174091941440. Its totient is φ = 205384441600.

The previous prime is 517638131683. The next prime is 517638131723. The reversal of 517638131720 is 27131836715.

It is not an unprimeable number, because it can be changed into a prime (517638131723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12613154 + ... + 12654126.

It is an arithmetic number, because the mean of its divisors is an integer number (18345186585).

Almost surely, 2^517638131720 is an apocalyptic number.

It is an amenable number.

517638131720 is an abundant number, since it is smaller than the sum of its proper divisors (656453809720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

517638131720 is a wasteful number, since it uses less digits than its factorization.

517638131720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43526 (or 43522 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 517638131720 in words is "five hundred seventeen billion, six hundred thirty-eight million, one hundred thirty-one thousand, seven hundred twenty".