166243325 has 6 divisors (see below), whose sum is σ = 206141754. Its totient is φ = 132994640.

The previous prime is 166243321. The next prime is 166243387. The reversal of 166243325 is 523342661.

It can be written as a sum of positive squares in 3 ways, for example, as 18645124 + 147598201 = 4318^2 + 12149^2 .

It is not a de Polignac number, because 166243325 - 2² = 166243321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166243291 and 166243300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166243321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3324842 + ... + 3324891.

It is an arithmetic number, because the mean of its divisors is an integer number (34356959).

Almost surely, 2^166243325 is an apocalyptic number.

It is an amenable number.

166243325 is a deficient number, since it is larger than the sum of its proper divisors (39898429).

166243325 is an equidigital number, since it uses as much as digits as its factorization.

166243325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6649743 (or 6649738 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 166243325 is about 12893.5381102318. The cubic root of 166243325 is about 549.8548652863.

Adding to 166243325 its reverse (523342661), we get a palindrome (689585986).

The spelling of 166243325 in words is "one hundred sixty-six million, two hundred forty-three thousand, three hundred twenty-five".