66664452073 has 2 divisors, whose sum is σ = 66664452074. Its totient is φ = 66664452072.

The previous prime is 66664451977. The next prime is 66664452079. The reversal of 66664452073 is 37025446666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46948922329 + 19715529744 = 216677^2 + 140412^2 .

It is a cyclic number.

It is not a de Polignac number, because 66664452073 - 2⁹ = 66664451561 is a prime.

It is not a weakly prime, because it can be changed into another prime (66664452079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33332226036 + 33332226037.

It is an arithmetic number, because the mean of its divisors is an integer number (33332226037).

Almost surely, 2^66664452073 is an apocalyptic number.

It is an amenable number.

66664452073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66664452073 is an equidigital number, since it uses as much as digits as its factorization.

66664452073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 66664452073 in words is "sixty-six billion, six hundred sixty-four million, four hundred fifty-two thousand, seventy-three".