665708602771 has 2 divisors, whose sum is σ = 665708602772. Its totient is φ = 665708602770.

The previous prime is 665708602723. The next prime is 665708602781. The reversal of 665708602771 is 177206807566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665708602771 - 2⁹ = 665708602259 is a prime.

It is not a weakly prime, because it can be changed into another prime (665708602721) 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, 332854301385 + 332854301386.

It is an arithmetic number, because the mean of its divisors is an integer number (332854301386).

Almost surely, 2^665708602771 is an apocalyptic number.

665708602771 is a deficient number, since it is larger than the sum of its proper divisors (1).

665708602771 is an equidigital number, since it uses as much as digits as its factorization.

665708602771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 665708602771 in words is "six hundred sixty-five billion, seven hundred eight million, six hundred two thousand, seven hundred seventy-one".