523666663 has 16 divisors (see below), whose sum is σ = 584851456. Its totient is φ = 465613920.

The previous prime is 523666651. The next prime is 523666687. The reversal of 523666663 is 366666325.

It is a cyclic number.

It is not a de Polignac number, because 523666663 - 2⁵ = 523666631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523666603) 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 in 15 ways as a sum of consecutive naturals, for example, 86956 + ... + 92782.

It is an arithmetic number, because the mean of its divisors is an integer number (36553216).

Almost surely, 2^523666663 is an apocalyptic number.

523666663 is a deficient number, since it is larger than the sum of its proper divisors (61184793).

523666663 is a wasteful number, since it uses less digits than its factorization.

523666663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6094.

The product of its digits is 699840, while the sum is 43.

The square root of 523666663 is about 22883.7641789982. The cubic root of 523666663 is about 806.0308094096.

The spelling of 523666663 in words is "five hundred twenty-three million, six hundred sixty-six thousand, six hundred sixty-three".