166725169 has 8 divisors (see below), whose sum is σ = 179994920. Its totient is φ = 153518976.

The previous prime is 166725151. The next prime is 166725191. The reversal of 166725169 is 961527661.

It can be written as a sum of positive squares in 4 ways, for example, as 48720400 + 118004769 = 6980^2 + 10863^2 .

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

It is not a de Polignac number, because 166725169 - 2¹¹ = 166723121 is a prime.

It is a super-2 number, since 2×166725169² = 55594563956157122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166725109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10362 + ... + 20995.

It is an arithmetic number, because the mean of its divisors is an integer number (22499365).

Almost surely, 2^166725169 is an apocalyptic number.

It is an amenable number.

166725169 is a deficient number, since it is larger than the sum of its proper divisors (13269751).

166725169 is a wasteful number, since it uses less digits than its factorization.

166725169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31779.

The product of its digits is 136080, while the sum is 43.

The square root of 166725169 is about 12912.2100741895. The cubic root of 166725169 is about 550.3855907661.

The spelling of 166725169 in words is "one hundred sixty-six million, seven hundred twenty-five thousand, one hundred sixty-nine".