166393 has 2 divisors, whose sum is σ = 166394. Its totient is φ = 166392.

The previous prime is 166363. The next prime is 166399. The reversal of 166393 is 393661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110224 + 56169 = 332^2 + 237^2 .

It is a cyclic number.

It is not a de Polignac number, because 166393 - 2¹³ = 158201 is a prime.

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 (166399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83196 + 83197.

It is an arithmetic number, because the mean of its divisors is an integer number (83197).

166393 is a Friedman number, since it can be written as 6*3+(9*6+1)^3, using all its digits and the basic arithmetic operations.

2¹⁶⁶³⁹³ is an apocalyptic number.

It is an amenable number.

166393 is a deficient number, since it is larger than the sum of its proper divisors (1).

166393 is an equidigital number, since it uses as much as digits as its factorization.

166393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 28.

The square root of 166393 is about 407.9129809163. The cubic root of 166393 is about 55.0019833995.

The spelling of 166393 in words is "one hundred sixty-six thousand, three hundred ninety-three".