6466450561 has 2 divisors, whose sum is σ = 6466450562. Its totient is φ = 6466450560.

The previous prime is 6466450547. The next prime is 6466450579. The reversal of 6466450561 is 1650546646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6045995536 + 420455025 = 77756^2 + 20505^2 .

It is a cyclic number.

It is not a de Polignac number, because 6466450561 - 2⁷ = 6466450433 is a prime.

It is not a weakly prime, because it can be changed into another prime (6466450591) 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, 3233225280 + 3233225281.

It is an arithmetic number, because the mean of its divisors is an integer number (3233225281).

Almost surely, 2^6466450561 is an apocalyptic number.

It is an amenable number.

6466450561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6466450561 is an equidigital number, since it uses as much as digits as its factorization.

6466450561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 6466450561 is about 80414.2435206599. The cubic root of 6466450561 is about 1863.0391753165.

The spelling of 6466450561 in words is "six billion, four hundred sixty-six million, four hundred fifty thousand, five hundred sixty-one".