166187725 has 12 divisors (see below), whose sum is σ = 224807040. Its totient is φ = 120863600.

The previous prime is 166187599. The next prime is 166187741. The reversal of 166187725 is 527781661.

It is not a de Polignac number, because 166187725 - 2²¹ = 164090573 is a prime.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 301885 + ... + 302434.

It is an arithmetic number, because the mean of its divisors is an integer number (18733920).

Almost surely, 2^166187725 is an apocalyptic number.

It is an amenable number.

166187725 is a deficient number, since it is larger than the sum of its proper divisors (58619315).

166187725 is a wasteful number, since it uses less digits than its factorization.

166187725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604340 (or 604335 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 166187725 is about 12891.3818111171. The cubic root of 166187725 is about 549.7935588862.

The spelling of 166187725 in words is "one hundred sixty-six million, one hundred eighty-seven thousand, seven hundred twenty-five".