166669 has 2 divisors, whose sum is σ = 166670.
Its totient is φ = 166668.
The previous prime is 166667. The next prime is 166679. The reversal of 166669 is 966661.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 149769 + 16900 = 387^2 + 130^2
It is an emirp because it is prime and its reverse (966661) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 166669 - 21 = 166667 is a prime.
It is a super-2 number, since 2×1666692 = 55557111122, which contains 22 as substring.
Together with 166667, it forms a pair of twin primes.
It is a plaindrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (166667) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334 + 83335.
It is an arithmetic number, because the mean of its divisors is an integer number (83335).
2166669 is an apocalyptic number.
It is an amenable number.
166669 is a deficient number, since it is larger than the sum of its proper divisors (1).
166669 is an equidigital number, since it uses as much as digits as its factorization.
166669 is an evil number, because the sum of its binary digits is even.
The product of its digits is 11664, while the sum is 34.
The square root of 166669 is about 408.2511481919.
The cubic root of 166669 is about 55.0323776303.
The spelling of 166669 in words is "one hundred sixty-six thousand, six hundred sixty-nine".