66075311577571 has 2 divisors, whose sum is σ = 66075311577572. Its totient is φ = 66075311577570.

The previous prime is 66075311577493. The next prime is 66075311577631. The reversal of 66075311577571 is 17577511357066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66075311577571 - 2¹⁷ = 66075311446499 is a prime.

It is not a weakly prime, because it can be changed into another prime (66075311577271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33037655788785 + 33037655788786.

It is an arithmetic number, because the mean of its divisors is an integer number (33037655788786).

Almost surely, 2^{66075311577571} is an apocalyptic number.

66075311577571 is a deficient number, since it is larger than the sum of its proper divisors (1).

66075311577571 is an equidigital number, since it uses as much as digits as its factorization.

66075311577571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32413500, while the sum is 61.

The spelling of 66075311577571 in words is "sixty-six trillion, seventy-five billion, three hundred eleven million, five hundred seventy-seven thousand, five hundred seventy-one".