166635225 has 120 divisors (see below), whose sum is σ = 334889280. Its totient is φ = 81648000.

The previous prime is 166635179. The next prime is 166635239. The reversal of 166635225 is 522536661.

It is a happy number.

It is not a de Polignac number, because 166635225 - 2¹⁰ = 166634201 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166635225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2346940 + ... + 2347010.

It is an arithmetic number, because the mean of its divisors is an integer number (2790744).

Almost surely, 2^166635225 is an apocalyptic number.

166635225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166635225 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

166635225 is a wasteful number, since it uses less digits than its factorization.

166635225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 159 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 166635225 is about 12908.7266994077. The cubic root of 166635225 is about 550.2865999408.

The spelling of 166635225 in words is "one hundred sixty-six million, six hundred thirty-five thousand, two hundred twenty-five".