166517 has 4 divisors (see below), whose sum is σ = 179340. Its totient is φ = 153696.

The previous prime is 166487. The next prime is 166541. The reversal of 166517 is 715661.

166517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715661 = 79 ⋅9059.

It can be written as a sum of positive squares in 2 ways, for example, as 37636 + 128881 = 194^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 166517 - 2¹⁶ = 100981 is a prime.

It is a super-2 number, since 2×166517² = 55455822578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6392 + ... + 6417.

It is an arithmetic number, because the mean of its divisors is an integer number (44835).

2¹⁶⁶⁵¹⁷ is an apocalyptic number.

It is an amenable number.

166517 is a deficient number, since it is larger than the sum of its proper divisors (12823).

166517 is a wasteful number, since it uses less digits than its factorization.

166517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12822.

The product of its digits is 1260, while the sum is 26.

The square root of 166517 is about 408.0649458113. The cubic root of 166517 is about 55.0156429334.

The spelling of 166517 in words is "one hundred sixty-six thousand, five hundred seventeen".