517438166387 has 2 divisors, whose sum is σ = 517438166388. Its totient is φ = 517438166386.

The previous prime is 517438166341. The next prime is 517438166423. The reversal of 517438166387 is 783661834715.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 517438166387 - 2²⁴ = 517421389171 is a prime.

It is not a weakly prime, because it can be changed into another prime (517438160387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258719083193 + 258719083194.

It is an arithmetic number, because the mean of its divisors is an integer number (258719083194).

Almost surely, 2^517438166387 is an apocalyptic number.

517438166387 is a deficient number, since it is larger than the sum of its proper divisors (1).

517438166387 is an equidigital number, since it uses as much as digits as its factorization.

517438166387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 59.

The spelling of 517438166387 in words is "five hundred seventeen billion, four hundred thirty-eight million, one hundred sixty-six thousand, three hundred eighty-seven".