517138565857919 has 2 divisors, whose sum is σ = 517138565857920. Its totient is φ = 517138565857918.

The previous prime is 517138565857877. The next prime is 517138565857973. The reversal of 517138565857919 is 919758565831715.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 517138565857919 - 2¹⁶ = 517138565792383 is a prime.

It is a super-2 number, since 2×517138565857919² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (517138565859919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258569282928959 + 258569282928960.

It is an arithmetic number, because the mean of its divisors is an integer number (258569282928960).

Almost surely, 2^{517138565857919} is an apocalyptic number.

517138565857919 is a deficient number, since it is larger than the sum of its proper divisors (1).

517138565857919 is an equidigital number, since it uses as much as digits as its factorization.

517138565857919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680000, while the sum is 80.

The spelling of 517138565857919 in words is "five hundred seventeen trillion, one hundred thirty-eight billion, five hundred sixty-five million, eight hundred fifty-seven thousand, nine hundred nineteen".