166185545 has 8 divisors (see below), whose sum is σ = 200457096. Its totient is φ = 132258816.

The previous prime is 166185431. The next prime is 166185559. The reversal of 166185545 is 545581661.

It can be written as a sum of positive squares in 4 ways, for example, as 17272336 + 148913209 = 4156^2 + 12203^2 .

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 166185545 - 2¹⁴ = 166169161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85142 + ... + 87071.

It is an arithmetic number, because the mean of its divisors is an integer number (25057137).

Almost surely, 2^166185545 is an apocalyptic number.

It is an amenable number.

166185545 is a deficient number, since it is larger than the sum of its proper divisors (34271551).

166185545 is a wasteful number, since it uses less digits than its factorization.

166185545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172411.

The product of its digits is 144000, while the sum is 41.

The square root of 166185545 is about 12891.2972582281. The cubic root of 166185545 is about 549.7911548675.

The spelling of 166185545 in words is "one hundred sixty-six million, one hundred eighty-five thousand, five hundred forty-five".