665020230689 has 2 divisors, whose sum is σ = 665020230690. Its totient is φ = 665020230688.

The previous prime is 665020230673. The next prime is 665020230727. The reversal of 665020230689 is 986032020566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579475680289 + 85544550400 = 761233^2 + 292480^2 .

It is a cyclic number.

It is not a de Polignac number, because 665020230689 - 2⁴ = 665020230673 is a prime.

It is a super-3 number, since 3×665020230689³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (665020230659) 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, 332510115344 + 332510115345.

It is an arithmetic number, because the mean of its divisors is an integer number (332510115345).

Almost surely, 2^665020230689 is an apocalyptic number.

It is an amenable number.

665020230689 is a deficient number, since it is larger than the sum of its proper divisors (1).

665020230689 is an equidigital number, since it uses as much as digits as its factorization.

665020230689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 665020230689 in words is "six hundred sixty-five billion, twenty million, two hundred thirty thousand, six hundred eighty-nine".