511535403405991 has 2 divisors, whose sum is σ = 511535403405992. Its totient is φ = 511535403405990.

The previous prime is 511535403405989. The next prime is 511535403406039. The reversal of 511535403405991 is 199504304535115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 511535403405991 - 2¹ = 511535403405989 is a prime.

Together with 511535403405989, 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 (511535403405931) 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 as a sum of consecutive naturals, namely, 255767701702995 + 255767701702996.

It is an arithmetic number, because the mean of its divisors is an integer number (255767701702996).

Almost surely, 2^{511535403405991} is an apocalyptic number.

511535403405991 is a deficient number, since it is larger than the sum of its proper divisors (1).

511535403405991 is an equidigital number, since it uses as much as digits as its factorization.

511535403405991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290000, while the sum is 55.

The spelling of 511535403405991 in words is "five hundred eleven trillion, five hundred thirty-five billion, four hundred three million, four hundred five thousand, nine hundred ninety-one".