66564612263 has 2 divisors, whose sum is σ = 66564612264. Its totient is φ = 66564612262.

The previous prime is 66564612251. The next prime is 66564612287. The reversal of 66564612263 is 36221646566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66564612263 - 2¹² = 66564608167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66564692263) 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, 33282306131 + 33282306132.

It is an arithmetic number, because the mean of its divisors is an integer number (33282306132).

Almost surely, 2^66564612263 is an apocalyptic number.

66564612263 is a deficient number, since it is larger than the sum of its proper divisors (1).

66564612263 is an equidigital number, since it uses as much as digits as its factorization.

66564612263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 47.

The spelling of 66564612263 in words is "sixty-six billion, five hundred sixty-four million, six hundred twelve thousand, two hundred sixty-three".