516505556477 has 2 divisors, whose sum is σ = 516505556478. Its totient is φ = 516505556476.

The previous prime is 516505556471. The next prime is 516505556537. The reversal of 516505556477 is 774655505615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 364790632441 + 151714924036 = 603979^2 + 389506^2 .

It is a cyclic number.

It is not a de Polignac number, because 516505556477 - 2¹⁰ = 516505555453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516505556471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258252778238 + 258252778239.

It is an arithmetic number, because the mean of its divisors is an integer number (258252778239).

Almost surely, 2^516505556477 is an apocalyptic number.

It is an amenable number.

516505556477 is a deficient number, since it is larger than the sum of its proper divisors (1).

516505556477 is an equidigital number, since it uses as much as digits as its factorization.

516505556477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22050000, while the sum is 56.

The spelling of 516505556477 in words is "five hundred sixteen billion, five hundred five million, five hundred fifty-six thousand, four hundred seventy-seven".