166919 has 2 divisors, whose sum is σ = 166920. Its totient is φ = 166918.

The previous prime is 166909. The next prime is 166931. The reversal of 166919 is 919661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166919 - 2¹² = 162823 is a prime.

It is a super-2 number, since 2×166919² = 55723905122, which contains 22 as substring.

It is a Chen 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 (166909) 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, 83459 + 83460.

It is an arithmetic number, because the mean of its divisors is an integer number (83460).

2¹⁶⁶⁹¹⁹ is an apocalyptic number.

166919 is a deficient number, since it is larger than the sum of its proper divisors (1).

166919 is an equidigital number, since it uses as much as digits as its factorization.

166919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 32.

The square root of 166919 is about 408.5572175351. The cubic root of 166919 is about 55.0598796876.

The spelling of 166919 in words is "one hundred sixty-six thousand, nine hundred nineteen".