66242755633 has 2 divisors, whose sum is σ = 66242755634. Its totient is φ = 66242755632.

The previous prime is 66242755619. The next prime is 66242755687. The reversal of 66242755633 is 33655724266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60075480609 + 6167275024 = 245103^2 + 78532^2 .

It is a cyclic number.

It is not a de Polignac number, because 66242755633 - 2³³ = 57652821041 is a prime.

It is not a weakly prime, because it can be changed into another prime (66242755693) 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, 33121377816 + 33121377817.

It is an arithmetic number, because the mean of its divisors is an integer number (33121377817).

Almost surely, 2^66242755633 is an apocalyptic number.

It is an amenable number.

66242755633 is a deficient number, since it is larger than the sum of its proper divisors (1).

66242755633 is an equidigital number, since it uses as much as digits as its factorization.

66242755633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 49.

The spelling of 66242755633 in words is "sixty-six billion, two hundred forty-two million, seven hundred fifty-five thousand, six hundred thirty-three".