66169 has 2 divisors, whose sum is σ = 66170. Its totient is φ = 66168.

The previous prime is 66161. The next prime is 66173. The reversal of 66169 is 96166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56169 + 10000 = 237^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 66169 - 2³ = 66161 is a prime.

It is a super-2 number, since 2×66169² = 8756673122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33084 + 33085.

It is an arithmetic number, because the mean of its divisors is an integer number (33085).

2⁶⁶¹⁶⁹ is an apocalyptic number.

It is an amenable number.

66169 is a deficient number, since it is larger than the sum of its proper divisors (1).

66169 is an equidigital number, since it uses as much as digits as its factorization.

66169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 66169 is about 257.2333570904. The cubic root of 66169 is about 40.4468642190.

The spelling of 66169 in words is "sixty-six thousand, one hundred sixty-nine".