166613 has 2 divisors, whose sum is σ = 166614. Its totient is φ = 166612.

The previous prime is 166609. The next prime is 166619. The reversal of 166613 is 316661.

166613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97969 + 68644 = 313^2 + 262^2 .

It is an emirp because it is prime and its reverse (316661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166613 - 2² = 166609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83306 + 83307.

It is an arithmetic number, because the mean of its divisors is an integer number (83307).

2¹⁶⁶⁶¹³ is an apocalyptic number.

It is an amenable number.

166613 is a deficient number, since it is larger than the sum of its proper divisors (1).

166613 is an equidigital number, since it uses as much as digits as its factorization.

166613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 166613 is about 408.1825571971. The cubic root of 166613 is about 55.0262133998.

The spelling of 166613 in words is "one hundred sixty-six thousand, six hundred thirteen".