166661125 has 8 divisors (see below), whose sum is σ = 207993240. Its totient is φ = 133328800.

The previous prime is 166661123. The next prime is 166661129. The reversal of 166661125 is 521166661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1846881 + 164814244 = 1359^2 + 12838^2 .

It is not a de Polignac number, because 166661125 - 2¹ = 166661123 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166661123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666520 + ... + 666769.

It is an arithmetic number, because the mean of its divisors is an integer number (25999155).

Almost surely, 2^166661125 is an apocalyptic number.

It is an amenable number.

166661125 is a deficient number, since it is larger than the sum of its proper divisors (41332115).

166661125 is an equidigital number, since it uses as much as digits as its factorization.

166661125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333304 (or 1333294 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 166661125 is about 12909.7298577468. The cubic root of 166661125 is about 550.3151086881.

The spelling of 166661125 in words is "one hundred sixty-six million, six hundred sixty-one thousand, one hundred twenty-five".