166525 has 6 divisors (see below), whose sum is σ = 206522. Its totient is φ = 133200.

The previous prime is 166487. The next prime is 166541. The reversal of 166525 is 525661.

It can be written as a sum of positive squares in 3 ways, for example, as 41209 + 125316 = 203^2 + 354^2 .

It is not a de Polignac number, because 166525 - 2⁹ = 166013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 6661 = 166525 / (1 + 6 + 6 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3306 + ... + 3355.

2¹⁶⁶⁵²⁵ is an apocalyptic number.

It is an amenable number.

166525 is a deficient number, since it is larger than the sum of its proper divisors (39997).

166525 is an equidigital number, since it uses as much as digits as its factorization.

166525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6671 (or 6666 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 166525 is about 408.0747480548. The cubic root of 166525 is about 55.0165239607.

The spelling of 166525 in words is "one hundred sixty-six thousand, five hundred twenty-five".