523566 has 48 divisors (see below), whose sum is σ = 1263600. Its totient is φ = 155904.

The previous prime is 523553. The next prime is 523571. The reversal of 523566 is 665325.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8845 + ... + 8903.

It is an arithmetic number, because the mean of its divisors is an integer number (26325).

2⁵²³⁵⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 523566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631800).

523566 is an abundant number, since it is smaller than the sum of its proper divisors (740034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

523566 is a wasteful number, since it uses less digits than its factorization.

523566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 110 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 523566 is about 723.5786066489. The cubic root of 523566 is about 80.5979159073.

It can be divided in two parts, 523 and 566, that added together give a square (1089 = 33²).

The spelling of 523566 in words is "five hundred twenty-three thousand, five hundred sixty-six".