665603471237 has 2 divisors, whose sum is σ = 665603471238. Its totient is φ = 665603471236.

The previous prime is 665603471219. The next prime is 665603471243. The reversal of 665603471237 is 732174306566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490449503041 + 175153968196 = 700321^2 + 418514^2 .

It is a cyclic number.

It is not a de Polignac number, because 665603471237 - 2⁶ = 665603471173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665603471207) 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, 332801735618 + 332801735619.

It is an arithmetic number, because the mean of its divisors is an integer number (332801735619).

Almost surely, 2^665603471237 is an apocalyptic number.

It is an amenable number.

665603471237 is a deficient number, since it is larger than the sum of its proper divisors (1).

665603471237 is an equidigital number, since it uses as much as digits as its factorization.

665603471237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 50.

The spelling of 665603471237 in words is "six hundred sixty-five billion, six hundred three million, four hundred seventy-one thousand, two hundred thirty-seven".