6556005650561 has 2 divisors, whose sum is σ = 6556005650562. Its totient is φ = 6556005650560.

The previous prime is 6556005650479. The next prime is 6556005650567. The reversal of 6556005650561 is 1650565006556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4761477490561 + 1794528160000 = 2182081^2 + 1339600^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556005650561 - 2¹⁴ = 6556005634177 is a prime.

It is a super-2 number, since 2×6556005650561² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6556005650567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278002825280 + 3278002825281.

It is an arithmetic number, because the mean of its divisors is an integer number (3278002825281).

Almost surely, 2^{6556005650561} is an apocalyptic number.

It is an amenable number.

6556005650561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556005650561 is an equidigital number, since it uses as much as digits as its factorization.

6556005650561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 6556005650561 in words is "six trillion, five hundred fifty-six billion, five million, six hundred fifty thousand, five hundred sixty-one".