516505551491 has 2 divisors, whose sum is σ = 516505551492. Its totient is φ = 516505551490.

The previous prime is 516505551481. The next prime is 516505551521. The reversal of 516505551491 is 194155505615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 516505551491 - 2²² = 516501357187 is a prime.

It is not a weakly prime, because it can be changed into another prime (516505551421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258252775745 + 258252775746.

It is an arithmetic number, because the mean of its divisors is an integer number (258252775746).

Almost surely, 2^516505551491 is an apocalyptic number.

516505551491 is a deficient number, since it is larger than the sum of its proper divisors (1).

516505551491 is an equidigital number, since it uses as much as digits as its factorization.

516505551491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 675000, while the sum is 47.

The spelling of 516505551491 in words is "five hundred sixteen billion, five hundred five million, five hundred fifty-one thousand, four hundred ninety-one".