665523311 has 2 divisors, whose sum is σ = 665523312. Its totient is φ = 665523310.

The previous prime is 665523301. The next prime is 665523323. The reversal of 665523311 is 113325566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665523311 is a prime.

It is equal to p_34558142 and since 665523311 and 34558142 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665523301) 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, 332761655 + 332761656.

It is an arithmetic number, because the mean of its divisors is an integer number (332761656).

Almost surely, 2^665523311 is an apocalyptic number.

665523311 is a deficient number, since it is larger than the sum of its proper divisors (1).

665523311 is an equidigital number, since it uses as much as digits as its factorization.

665523311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

The square root of 665523311 is about 25797.7384861542. The cubic root of 665523311 is about 873.0807723770.

Adding to 665523311 its reverse (113325566), we get a palindrome (778848877).

The spelling of 665523311 in words is "six hundred sixty-five million, five hundred twenty-three thousand, three hundred eleven".