66330280743691 has 2 divisors, whose sum is σ = 66330280743692. Its totient is φ = 66330280743690.

The previous prime is 66330280743619. The next prime is 66330280743719. The reversal of 66330280743691 is 19634708203366.

66330280743691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (66330280743619) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66330280743691 - 2⁷ = 66330280743563 is a prime.

It is a super-2 number, since 2×66330280743691² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66330280743091) 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, 33165140371845 + 33165140371846.

It is an arithmetic number, because the mean of its divisors is an integer number (33165140371846).

Almost surely, 2^{66330280743691} is an apocalyptic number.

66330280743691 is a deficient number, since it is larger than the sum of its proper divisors (1).

66330280743691 is an equidigital number, since it uses as much as digits as its factorization.

66330280743691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23514624, while the sum is 58.

The spelling of 66330280743691 in words is "sixty-six trillion, three hundred thirty billion, two hundred eighty million, seven hundred forty-three thousand, six hundred ninety-one".