665533523 has 2 divisors, whose sum is σ = 665533524. Its totient is φ = 665533522.

The previous prime is 665533483. The next prime is 665533559. The reversal of 665533523 is 325335566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665533523 - 2¹⁰ = 665532499 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (665533123) 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, 332766761 + 332766762.

It is an arithmetic number, because the mean of its divisors is an integer number (332766762).

Almost surely, 2^665533523 is an apocalyptic number.

665533523 is a deficient number, since it is larger than the sum of its proper divisors (1).

665533523 is an equidigital number, since it uses as much as digits as its factorization.

665533523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243000, while the sum is 38.

The square root of 665533523 is about 25797.9364097208. The cubic root of 665533523 is about 873.0852379632.

The spelling of 665533523 in words is "six hundred sixty-five million, five hundred thirty-three thousand, five hundred twenty-three".