517178490649 has 6 divisors (see below), whose sum is σ = 522565203534. Its totient is φ = 511846744320.

The previous prime is 517178490593. The next prime is 517178490713. The reversal of 517178490649 is 946094871715.

It can be written as a sum of positive squares in 3 ways, for example, as 169365171600 + 347813319049 = 411540^2 + 589757^2 .

It is not a de Polignac number, because 517178490649 - 2⁹ = 517178490137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (517178491649) 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 5 ways as a sum of consecutive naturals, for example, 27473772 + ... + 27492589.

It is an arithmetic number, because the mean of its divisors is an integer number (87094200589).

Almost surely, 2^517178490649 is an apocalyptic number.

It is an amenable number.

517178490649 is a deficient number, since it is larger than the sum of its proper divisors (5386712885).

517178490649 is an frugal number, since it uses more digits than its factorization.

517178490649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54966555 (or 54966458 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 517178490649 in words is "five hundred seventeen billion, one hundred seventy-eight million, four hundred ninety thousand, six hundred forty-nine".