66594660971 has 2 divisors, whose sum is σ = 66594660972. Its totient is φ = 66594660970.

The previous prime is 66594660967. The next prime is 66594660997. The reversal of 66594660971 is 17906649566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66594660971 - 2² = 66594660967 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66594660971.

It is not a weakly prime, because it can be changed into another prime (66594660911) 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, 33297330485 + 33297330486.

It is an arithmetic number, because the mean of its divisors is an integer number (33297330486).

Almost surely, 2^66594660971 is an apocalyptic number.

66594660971 is a deficient number, since it is larger than the sum of its proper divisors (1).

66594660971 is an equidigital number, since it uses as much as digits as its factorization.

66594660971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14696640, while the sum is 59.

The spelling of 66594660971 in words is "sixty-six billion, five hundred ninety-four million, six hundred sixty thousand, nine hundred seventy-one".