517907129447 has 4 divisors (see below), whose sum is σ = 517908692400. Its totient is φ = 517905566496.

The previous prime is 517907129431. The next prime is 517907129561. The reversal of 517907129447 is 744921709715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 517907129447 - 2⁴ = 517907129431 is a prime.

It is a super-2 number, since 2×517907129447² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 517907129392 and 517907129401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517907129407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66203 + ... + 1019900.

It is an arithmetic number, because the mean of its divisors is an integer number (129477173100).

Almost surely, 2^517907129447 is an apocalyptic number.

517907129447 is a deficient number, since it is larger than the sum of its proper divisors (1562953).

517907129447 is a wasteful number, since it uses less digits than its factorization.

517907129447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562952.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The spelling of 517907129447 in words is "five hundred seventeen billion, nine hundred seven million, one hundred twenty-nine thousand, four hundred forty-seven".