170661 has 8 divisors (see below), whose sum is σ = 229600. Its totient is φ = 112752.

The previous prime is 170647. The next prime is 170669. The reversal of 170661 is 166071.

170661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 170661 - 2¹⁴ = 154277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315 + ... + 663.

It is an arithmetic number, because the mean of its divisors is an integer number (28700).

2¹⁷⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

170661 is a deficient number, since it is larger than the sum of its proper divisors (58939).

170661 is a wasteful number, since it uses less digits than its factorization.

170661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 170661 is about 413.1113651305. Note that the first 3 decimals coincide. The cubic root of 170661 is about 55.4682880276.

The spelling of 170661 in words is "one hundred seventy thousand, six hundred sixty-one".