166625189 has 8 divisors (see below), whose sum is σ = 170880192. Its totient is φ = 162379360.

The previous prime is 166625131. The next prime is 166625191. The reversal of 166625189 is 981526661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166625189 - 2⁸ = 166624933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166625119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48482 + ... + 51804.

It is an arithmetic number, because the mean of its divisors is an integer number (21360024).

Almost surely, 2^166625189 is an apocalyptic number.

It is an amenable number.

166625189 is a deficient number, since it is larger than the sum of its proper divisors (4255003).

166625189 is a wasteful number, since it uses less digits than its factorization.

166625189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587.

The product of its digits is 155520, while the sum is 44.

The square root of 166625189 is about 12908.3379642772. The cubic root of 166625189 is about 550.2755522822.

The spelling of 166625189 in words is "one hundred sixty-six million, six hundred twenty-five thousand, one hundred eighty-nine".