6566061061649 has 2 divisors, whose sum is σ = 6566061061650. Its totient is φ = 6566061061648.

The previous prime is 6566061061639. The next prime is 6566061061663. The reversal of 6566061061649 is 9461601606656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4775798329600 + 1790262732049 = 2185360^2 + 1338007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6566061061649 is a prime.

It is a super-2 number, since 2×6566061061649² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6566061061594 and 6566061061603.

It is not a weakly prime, because it can be changed into another prime (6566061061639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3283030530824 + 3283030530825.

It is an arithmetic number, because the mean of its divisors is an integer number (3283030530825).

Almost surely, 2^{6566061061649} is an apocalyptic number.

It is an amenable number.

6566061061649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6566061061649 is an equidigital number, since it uses as much as digits as its factorization.

6566061061649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 56.

The spelling of 6566061061649 in words is "six trillion, five hundred sixty-six billion, sixty-one million, sixty-one thousand, six hundred forty-nine".