66713447237 has 2 divisors, whose sum is σ = 66713447238. Its totient is φ = 66713447236.

The previous prime is 66713447221. The next prime is 66713447239. The reversal of 66713447237 is 73274431766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47425515076 + 19287932161 = 217774^2 + 138881^2 .

It is a cyclic number.

It is not a de Polignac number, because 66713447237 - 2⁴ = 66713447221 is a prime.

Together with 66713447239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66713447239) 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, 33356723618 + 33356723619.

It is an arithmetic number, because the mean of its divisors is an integer number (33356723619).

Almost surely, 2^66713447237 is an apocalyptic number.

It is an amenable number.

66713447237 is a deficient number, since it is larger than the sum of its proper divisors (1).

66713447237 is an equidigital number, since it uses as much as digits as its factorization.

66713447237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 50.

The spelling of 66713447237 in words is "sixty-six billion, seven hundred thirteen million, four hundred forty-seven thousand, two hundred thirty-seven".