66564457327 has 2 divisors, whose sum is σ = 66564457328. Its totient is φ = 66564457326.

The previous prime is 66564457283. The next prime is 66564457357. The reversal of 66564457327 is 72375446566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66564457327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66564457357) 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, 33282228663 + 33282228664.

It is an arithmetic number, because the mean of its divisors is an integer number (33282228664).

Almost surely, 2^66564457327 is an apocalyptic number.

66564457327 is a deficient number, since it is larger than the sum of its proper divisors (1).

66564457327 is an equidigital number, since it uses as much as digits as its factorization.

66564457327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 55.

The spelling of 66564457327 in words is "sixty-six billion, five hundred sixty-four million, four hundred fifty-seven thousand, three hundred twenty-seven".