66693810377 has 2 divisors, whose sum is σ = 66693810378. Its totient is φ = 66693810376.

The previous prime is 66693810367. The next prime is 66693810427. The reversal of 66693810377 is 77301839666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66493842496 + 199967881 = 257864^2 + 14141^2 .

It is a cyclic number.

It is not a de Polignac number, because 66693810377 - 2⁸ = 66693810121 is a prime.

It is not a weakly prime, because it can be changed into another prime (66693810367) 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, 33346905188 + 33346905189.

It is an arithmetic number, because the mean of its divisors is an integer number (33346905189).

Almost surely, 2^66693810377 is an apocalyptic number.

It is an amenable number.

66693810377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66693810377 is an equidigital number, since it uses as much as digits as its factorization.

66693810377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 66693810377 in words is "sixty-six billion, six hundred ninety-three million, eight hundred ten thousand, three hundred seventy-seven".