6500561161 has 2 divisors, whose sum is σ = 6500561162. Its totient is φ = 6500561160.

The previous prime is 6500561147. The next prime is 6500561173. The reversal of 6500561161 is 1611650056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5288198400 + 1212362761 = 72720^2 + 34819^2 .

It is a cyclic number.

It is not a de Polignac number, because 6500561161 - 2¹⁷ = 6500430089 is a prime.

It is not a weakly prime, because it can be changed into another prime (6500561101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3250280580 + 3250280581.

It is an arithmetic number, because the mean of its divisors is an integer number (3250280581).

Almost surely, 2^6500561161 is an apocalyptic number.

It is an amenable number.

6500561161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6500561161 is an equidigital number, since it uses as much as digits as its factorization.

6500561161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 6500561161 is about 80626.0575806606. The cubic root of 6500561161 is about 1866.3092830092.

The spelling of 6500561161 in words is "six billion, five hundred million, five hundred sixty-one thousand, one hundred sixty-one".