66930173197 has 2 divisors, whose sum is σ = 66930173198. Its totient is φ = 66930173196.

The previous prime is 66930173179. The next prime is 66930173231. The reversal of 66930173197 is 79137103966.

Together with previous prime (66930173179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65518593156 + 1411580041 = 255966^2 + 37571^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66930173197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66930173137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33465086598 + 33465086599.

It is an arithmetic number, because the mean of its divisors is an integer number (33465086599).

Almost surely, 2^66930173197 is an apocalyptic number.

It is an amenable number.

66930173197 is a deficient number, since it is larger than the sum of its proper divisors (1).

66930173197 is an equidigital number, since it uses as much as digits as its factorization.

66930173197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 52.

The spelling of 66930173197 in words is "sixty-six billion, nine hundred thirty million, one hundred seventy-three thousand, one hundred ninety-seven".