66075565560247 has 2 divisors, whose sum is σ = 66075565560248. Its totient is φ = 66075565560246.

The previous prime is 66075565560217. The next prime is 66075565560281. The reversal of 66075565560247 is 74206556557066.

It is a happy number.

66075565560247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66075565560247 - 2¹⁵ = 66075565527479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66075565560217) 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, 33037782780123 + 33037782780124.

It is an arithmetic number, because the mean of its divisors is an integer number (33037782780124).

Almost surely, 2^{66075565560247} is an apocalyptic number.

66075565560247 is a deficient number, since it is larger than the sum of its proper divisors (1).

66075565560247 is an equidigital number, since it uses as much as digits as its factorization.

66075565560247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520000, while the sum is 64.

The spelling of 66075565560247 in words is "sixty-six trillion, seventy-five billion, five hundred sixty-five million, five hundred sixty thousand, two hundred forty-seven".