509999798911 has 2 divisors, whose sum is σ = 509999798912. Its totient is φ = 509999798910.

The previous prime is 509999798909. The next prime is 509999798947. The reversal of 509999798911 is 119897999905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509999798911 - 2¹ = 509999798909 is a prime.

Together with 509999798909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509999798981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254999899455 + 254999899456.

It is an arithmetic number, because the mean of its divisors is an integer number (254999899456).

Almost surely, 2^509999798911 is an apocalyptic number.

509999798911 is a deficient number, since it is larger than the sum of its proper divisors (1).

509999798911 is an equidigital number, since it uses as much as digits as its factorization.

509999798911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148803480, while the sum is 76.

The spelling of 509999798911 in words is "five hundred nine billion, nine hundred ninety-nine million, seven hundred ninety-eight thousand, nine hundred eleven".