6505411546661 has 2 divisors, whose sum is σ = 6505411546662. Its totient is φ = 6505411546660.

The previous prime is 6505411546649. The next prime is 6505411546663. The reversal of 6505411546661 is 1666451145056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4359535202500 + 2145876344161 = 2087950^2 + 1464881^2 .

It is a cyclic number.

It is not a de Polignac number, because 6505411546661 - 2¹⁸ = 6505411284517 is a prime.

Together with 6505411546663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6505411546663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3252705773330 + 3252705773331.

It is an arithmetic number, because the mean of its divisors is an integer number (3252705773331).

Almost surely, 2^{6505411546661} is an apocalyptic number.

It is an amenable number.

6505411546661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6505411546661 is an equidigital number, since it uses as much as digits as its factorization.

6505411546661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 6505411546661 in words is "six trillion, five hundred five billion, four hundred eleven million, five hundred forty-six thousand, six hundred sixty-one".