166625 has 16 divisors (see below), whose sum is σ = 219648. Its totient is φ = 126000.

The previous prime is 166619. The next prime is 166627. The reversal of 166625 is 526661.

166625 = 40² + 41² + ... + 82².

It is not a de Polignac number, because 166625 - 2⁴ = 166609 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166594 and 166603.

It is not an unprimeable number, because it can be changed into a prime (166627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3854 + ... + 3896.

It is an arithmetic number, because the mean of its divisors is an integer number (13728).

2¹⁶⁶⁶²⁵ is an apocalyptic number.

It is an amenable number.

166625 is a deficient number, since it is larger than the sum of its proper divisors (53023).

166625 is an equidigital number, since it uses as much as digits as its factorization.

166625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 79 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 166625 is about 408.1972562377. The cubic root of 166625 is about 55.0275344226.

The spelling of 166625 in words is "one hundred sixty-six thousand, six hundred twenty-five".