166530025 has 12 divisors (see below), whose sum is σ = 209113600. Its totient is φ = 131536080.

The previous prime is 166529989. The next prime is 166530029. The reversal of 166530025 is 520035661.

It is not a de Polignac number, because 166530025 - 2²⁵ = 132975593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166529975 and 166530002.

It is not an unprimeable number, because it can be changed into a prime (166530029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40185 + ... + 44134.

Almost surely, 2^166530025 is an apocalyptic number.

It is an amenable number.

166530025 is a deficient number, since it is larger than the sum of its proper divisors (42583575).

166530025 is an equidigital number, since it uses as much as digits as its factorization.

166530025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84408 (or 84403 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 166530025 is about 12904.6512932353. The cubic root of 166530025 is about 550.1707734161.

Adding to 166530025 its reverse (520035661), we get a palindrome (686565686).

The spelling of 166530025 in words is "one hundred sixty-six million, five hundred thirty thousand, twenty-five".