6516454561 has 2 divisors, whose sum is σ = 6516454562. Its totient is φ = 6516454560.

The previous prime is 6516454537. The next prime is 6516454589. The reversal of 6516454561 is 1654546156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5872310161 + 644144400 = 76631^2 + 25380^2 .

It is a cyclic number.

It is not a de Polignac number, because 6516454561 - 2¹¹ = 6516452513 is a prime.

It is not a weakly prime, because it can be changed into another prime (6516454591) 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, 3258227280 + 3258227281.

It is an arithmetic number, because the mean of its divisors is an integer number (3258227281).

Almost surely, 2^6516454561 is an apocalyptic number.

It is an amenable number.

6516454561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516454561 is an equidigital number, since it uses as much as digits as its factorization.

6516454561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 43.

The square root of 6516454561 is about 80724.5598377594. The cubic root of 6516454561 is about 1867.8290420061.

The spelling of 6516454561 in words is "six billion, five hundred sixteen million, four hundred fifty-four thousand, five hundred sixty-one".