665023523 has 2 divisors, whose sum is σ = 665023524. Its totient is φ = 665023522.

The previous prime is 665023487. The next prime is 665023529. The reversal of 665023523 is 325320566.

665023523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665023523 - 2¹⁶ = 664957987 is a prime.

It is a super-2 number, since 2×665023523² = 884512572286663058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665023523.

It is not a weakly prime, because it can be changed into another prime (665023529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332511761 + 332511762.

It is an arithmetic number, because the mean of its divisors is an integer number (332511762).

Almost surely, 2^665023523 is an apocalyptic number.

665023523 is a deficient number, since it is larger than the sum of its proper divisors (1).

665023523 is an equidigital number, since it uses as much as digits as its factorization.

665023523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 665023523 is about 25788.0500038293. The cubic root of 665023523 is about 872.8621651740.

The spelling of 665023523 in words is "six hundred sixty-five million, twenty-three thousand, five hundred twenty-three".