66566634727799 has 2 divisors, whose sum is σ = 66566634727800. Its totient is φ = 66566634727798.

The previous prime is 66566634727763. The next prime is 66566634727837. The reversal of 66566634727799 is 99772743666566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66566634727799 - 2¹² = 66566634723703 is a prime.

It is a super-2 number, since 2×66566634727799² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66566634627799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283317363899 + 33283317363900.

It is an arithmetic number, because the mean of its divisors is an integer number (33283317363900).

Almost surely, 2^{66566634727799} is an apocalyptic number.

66566634727799 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566634727799 is an equidigital number, since it uses as much as digits as its factorization.

66566634727799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25924872960, while the sum is 83.

The spelling of 66566634727799 in words is "sixty-six trillion, five hundred sixty-six billion, six hundred thirty-four million, seven hundred twenty-seven thousand, seven hundred ninety-nine".