665615107393 has 2 divisors, whose sum is σ = 665615107394. Its totient is φ = 665615107392.

The previous prime is 665615107379. The next prime is 665615107427. The reversal of 665615107393 is 393701516566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487102097329 + 178513010064 = 697927^2 + 422508^2 .

It is a cyclic number.

It is not a de Polignac number, because 665615107393 - 2⁹ = 665615106881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665615107393.

It is not a weakly prime, because it can be changed into another prime (665615107373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332807553696 + 332807553697.

It is an arithmetic number, because the mean of its divisors is an integer number (332807553697).

Almost surely, 2^665615107393 is an apocalyptic number.

It is an amenable number.

665615107393 is a deficient number, since it is larger than the sum of its proper divisors (1).

665615107393 is an equidigital number, since it uses as much as digits as its factorization.

665615107393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3061800, while the sum is 52.

The spelling of 665615107393 in words is "six hundred sixty-five billion, six hundred fifteen million, one hundred seven thousand, three hundred ninety-three".