66966837757 has 2 divisors, whose sum is σ = 66966837758. Its totient is φ = 66966837756.

The previous prime is 66966837713. The next prime is 66966837761. The reversal of 66966837757 is 75773866966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45937777561 + 21029060196 = 214331^2 + 145014^2 .

It is a cyclic number.

It is not a de Polignac number, because 66966837757 - 2³¹ = 64819354109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66966837797) 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, 33483418878 + 33483418879.

It is an arithmetic number, because the mean of its divisors is an integer number (33483418879).

Almost surely, 2^66966837757 is an apocalyptic number.

It is an amenable number.

66966837757 is a deficient number, since it is larger than the sum of its proper divisors (1).

66966837757 is an equidigital number, since it uses as much as digits as its factorization.

66966837757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480090240, while the sum is 70.

The spelling of 66966837757 in words is "sixty-six billion, nine hundred sixty-six million, eight hundred thirty-seven thousand, seven hundred fifty-seven".