66241644577 has 2 divisors, whose sum is σ = 66241644578. Its totient is φ = 66241644576.

The previous prime is 66241644551. The next prime is 66241644611. The reversal of 66241644577 is 77544614266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52797010176 + 13444634401 = 229776^2 + 115951^2 .

It is a cyclic number.

It is not a de Polignac number, because 66241644577 - 2²³ = 66233255969 is a prime.

It is not a weakly prime, because it can be changed into another prime (66241644277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33120822288 + 33120822289.

It is an arithmetic number, because the mean of its divisors is an integer number (33120822289).

Almost surely, 2^66241644577 is an apocalyptic number.

It is an amenable number.

66241644577 is a deficient number, since it is larger than the sum of its proper divisors (1).

66241644577 is an equidigital number, since it uses as much as digits as its factorization.

66241644577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 52.

The spelling of 66241644577 in words is "sixty-six billion, two hundred forty-one million, six hundred forty-four thousand, five hundred seventy-seven".