666563305273 has 2 divisors, whose sum is σ = 666563305274. Its totient is φ = 666563305272.

The previous prime is 666563305249. The next prime is 666563305297. The reversal of 666563305273 is 372503365666.

It is a balanced prime because it is at equal distance from previous prime (666563305249) and next prime (666563305297).

It can be written as a sum of positive squares in only one way, i.e., 576222182649 + 90341122624 = 759093^2 + 300568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666563305273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666563305273.

It is not a weakly prime, because it can be changed into another prime (666563305223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333281652636 + 333281652637.

It is an arithmetic number, because the mean of its divisors is an integer number (333281652637).

Almost surely, 2^666563305273 is an apocalyptic number.

It is an amenable number.

666563305273 is a deficient number, since it is larger than the sum of its proper divisors (1).

666563305273 is an equidigital number, since it uses as much as digits as its factorization.

666563305273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12247200, while the sum is 52.

The spelling of 666563305273 in words is "six hundred sixty-six billion, five hundred sixty-three million, three hundred five thousand, two hundred seventy-three".