665612413 has 2 divisors, whose sum is σ = 665612414. Its totient is φ = 665612412.

The previous prime is 665612369. The next prime is 665612443. The reversal of 665612413 is 314216566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 452072644 + 213539769 = 21262^2 + 14613^2 .

It is a cyclic number.

It is not a de Polignac number, because 665612413 - 2¹³ = 665604221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665612443) 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, 332806206 + 332806207.

It is an arithmetic number, because the mean of its divisors is an integer number (332806207).

Almost surely, 2^665612413 is an apocalyptic number.

It is an amenable number.

665612413 is a deficient number, since it is larger than the sum of its proper divisors (1).

665612413 is an equidigital number, since it uses as much as digits as its factorization.

665612413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 665612413 is about 25799.4653626776. The cubic root of 665612413 is about 873.1197340834.

Adding to 665612413 its reverse (314216566), we get a palindrome (979828979).

The spelling of 665612413 in words is "six hundred sixty-five million, six hundred twelve thousand, four hundred thirteen".