166601 has 2 divisors, whose sum is σ = 166602. Its totient is φ = 166600.

The previous prime is 166597. The next prime is 166603. The reversal of 166601 is 106661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144400 + 22201 = 380^2 + 149^2 .

It is an emirp because it is prime and its reverse (106661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166601 - 2² = 166597 is a prime.

Together with 166603, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166601.

It is not a weakly prime, because it can be changed into another prime (166603) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83300 + 83301.

It is an arithmetic number, because the mean of its divisors is an integer number (83301).

2¹⁶⁶⁶⁰¹ is an apocalyptic number.

It is an amenable number.

166601 is a deficient number, since it is larger than the sum of its proper divisors (1).

166601 is an equidigital number, since it uses as much as digits as its factorization.

166601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 166601 is about 408.1678576272. The cubic root of 166601 is about 55.0248923136.

It can be divided in two parts, 16660 and 1, that added together give a palindrome (16661).

The spelling of 166601 in words is "one hundred sixty-six thousand, six hundred one".