166685143 has 2 divisors, whose sum is σ = 166685144. Its totient is φ = 166685142.

The previous prime is 166685137. The next prime is 166685177. The reversal of 166685143 is 341586661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166685143 - 2⁹ = 166684631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166685096 and 166685105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166605143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83342571 + 83342572.

It is an arithmetic number, because the mean of its divisors is an integer number (83342572).

Almost surely, 2^166685143 is an apocalyptic number.

166685143 is a deficient number, since it is larger than the sum of its proper divisors (1).

166685143 is an equidigital number, since it uses as much as digits as its factorization.

166685143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 40.

The square root of 166685143 is about 12910.6600528401. The cubic root of 166685143 is about 550.3415432339.

The spelling of 166685143 in words is "one hundred sixty-six million, six hundred eighty-five thousand, one hundred forty-three".