66564612229 has 2 divisors, whose sum is σ = 66564612230. Its totient is φ = 66564612228.

The previous prime is 66564612181. The next prime is 66564612251. The reversal of 66564612229 is 92221646566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50040795204 + 16523817025 = 223698^2 + 128545^2 .

It is a cyclic number.

It is not a de Polignac number, because 66564612229 - 2²¹ = 66562515077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66564612299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33282306114 + 33282306115.

It is an arithmetic number, because the mean of its divisors is an integer number (33282306115).

Almost surely, 2^66564612229 is an apocalyptic number.

It is an amenable number.

66564612229 is a deficient number, since it is larger than the sum of its proper divisors (1).

66564612229 is an equidigital number, since it uses as much as digits as its factorization.

66564612229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 49.

The spelling of 66564612229 in words is "sixty-six billion, five hundred sixty-four million, six hundred twelve thousand, two hundred twenty-nine".