6660660848461 has 2 divisors, whose sum is σ = 6660660848462. Its totient is φ = 6660660848460.

The previous prime is 6660660848447. The next prime is 6660660848473. The reversal of 6660660848461 is 1648480660666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5972207316100 + 688453532361 = 2443810^2 + 829731^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660660848461 - 2⁷ = 6660660848333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6660660848461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6660660848411) 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, 3330330424230 + 3330330424231.

It is an arithmetic number, because the mean of its divisors is an integer number (3330330424231).

Almost surely, 2^{6660660848461} is an apocalyptic number.

It is an amenable number.

6660660848461 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660660848461 is an equidigital number, since it uses as much as digits as its factorization.

6660660848461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47775744, while the sum is 61.

The spelling of 6660660848461 in words is "six trillion, six hundred sixty billion, six hundred sixty million, eight hundred forty-eight thousand, four hundred sixty-one".