166667 has 2 divisors, whose sum is σ = 166668. Its totient is φ = 166666.

The previous prime is 166657. The next prime is 166669. The reversal of 166667 is 766661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166667 - 2⁶ = 166603 is a prime.

It is a super-4 number, since 4×166667⁴ (a number of 22 digits) contains 4444 as substring.

Together with 166669, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (166669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333 + 83334.

It is an arithmetic number, because the mean of its divisors is an integer number (83334).

2¹⁶⁶⁶⁶⁷ is an apocalyptic number.

166667 is a deficient number, since it is larger than the sum of its proper divisors (1).

166667 is an equidigital number, since it uses as much as digits as its factorization.

166667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 166667 is about 408.2486987119. The cubic root of 166667 is about 55.0321575030.

The spelling of 166667 in words is "one hundred sixty-six thousand, six hundred sixty-seven".