525666 has 16 divisors (see below), whose sum is σ = 1065600. Its totient is φ = 172848.

The previous prime is 525649. The next prime is 525671. The reversal of 525666 is 666525.

It is a d-powerful number, because it can be written as 5 + 2¹⁹ + 6² + 5 + 6² + 6⁴ .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 525666.

It is an unprimeable number.

525666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81 + ... + 1028.

It is an arithmetic number, because the mean of its divisors is an integer number (66600).

2⁵²⁵⁶⁶⁶ is an apocalyptic number.

525666 is an abundant number, since it is smaller than the sum of its proper divisors (539934).

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

525666 is a wasteful number, since it uses less digits than its factorization.

525666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193.

The product of its digits is 10800, while the sum is 30.

The square root of 525666 is about 725.0282753107. The cubic root of 525666 is about 80.7055303780.

The spelling of 525666 in words is "five hundred twenty-five thousand, six hundred sixty-six".