166656225 has 24 divisors (see below), whose sum is σ = 276371200. Its totient is φ = 88614720.

The previous prime is 166656223. The next prime is 166656227. The reversal of 166656225 is 522656661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (166656223) and next prime (166656227).

It is not a de Polignac number, because 166656225 - 2¹ = 166656223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166656223) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 22992 + ... + 29358.

Almost surely, 2^166656225 is an apocalyptic number.

166656225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166656225 is a deficient number, since it is larger than the sum of its proper divisors (109714975).

166656225 is a wasteful number, since it uses less digits than its factorization.

166656225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6729 (or 6724 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 166656225 is about 12909.5400770128. The cubic root of 166656225 is about 550.3097153679.

The spelling of 166656225 in words is "one hundred sixty-six million, six hundred fifty-six thousand, two hundred twenty-five".