6516391577 has 2 divisors, whose sum is σ = 6516391578. Its totient is φ = 6516391576.

The previous prime is 6516391571. The next prime is 6516391589. The reversal of 6516391577 is 7751936156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6328043401 + 188348176 = 79549^2 + 13724^2 .

It is a cyclic number.

It is not a de Polignac number, because 6516391577 - 2¹² = 6516387481 is a prime.

It is not a weakly prime, because it can be changed into another prime (6516391571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258195788 + 3258195789.

It is an arithmetic number, because the mean of its divisors is an integer number (3258195789).

Almost surely, 2^6516391577 is an apocalyptic number.

It is an amenable number.

6516391577 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516391577 is an equidigital number, since it uses as much as digits as its factorization.

6516391577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1190700, while the sum is 50.

The square root of 6516391577 is about 80724.1697201030. The cubic root of 6516391577 is about 1867.8230242284.

The spelling of 6516391577 in words is "six billion, five hundred sixteen million, three hundred ninety-one thousand, five hundred seventy-seven".