523666 has 16 divisors (see below), whose sum is σ = 923328. Its totient is φ = 219600.

The previous prime is 523657. The next prime is 523667. The reversal of 523666 is 666325.

523666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (523667) by changing a digit.

523666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630 + ... + 1201.

It is an arithmetic number, because the mean of its divisors is an integer number (57708).

2⁵²³⁶⁶⁶ is an apocalyptic number.

523666 is a deficient number, since it is larger than the sum of its proper divisors (399662).

523666 is a wasteful number, since it uses less digits than its factorization.

523666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857.

The product of its digits is 6480, while the sum is 28.

The square root of 523666 is about 723.6477043424. The cubic root of 523666 is about 80.6030469245.

The spelling of 523666 in words is "five hundred twenty-three thousand, six hundred sixty-six".