665500005473 has 2 divisors, whose sum is σ = 665500005474. Its totient is φ = 665500005472.

The previous prime is 665500005449. The next prime is 665500005551. The reversal of 665500005473 is 374500005566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642381411169 + 23118594304 = 801487^2 + 152048^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665500005473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665500005473.

It is not a weakly prime, because it can be changed into another prime (665500005413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332750002736 + 332750002737.

It is an arithmetic number, because the mean of its divisors is an integer number (332750002737).

Almost surely, 2^665500005473 is an apocalyptic number.

It is an amenable number.

665500005473 is a deficient number, since it is larger than the sum of its proper divisors (1).

665500005473 is an equidigital number, since it uses as much as digits as its factorization.

665500005473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 41.

The spelling of 665500005473 in words is "six hundred sixty-five billion, five hundred million, five thousand, four hundred seventy-three".