166966543 has 4 divisors (see below), whose sum is σ = 172724040. Its totient is φ = 161209048.

The previous prime is 166966531. The next prime is 166966559. The reversal of 166966543 is 345669661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166966543 - 2²¹ = 164869391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166966493 and 166966502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166966573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2878705 + ... + 2878762.

It is an arithmetic number, because the mean of its divisors is an integer number (43181010).

Almost surely, 2^166966543 is an apocalyptic number.

166966543 is a deficient number, since it is larger than the sum of its proper divisors (5757497).

166966543 is an equidigital number, since it uses as much as digits as its factorization.

166966543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5757496.

The product of its digits is 699840, while the sum is 46.

The square root of 166966543 is about 12921.5534282841. The cubic root of 166966543 is about 550.6510670065.

The spelling of 166966543 in words is "one hundred sixty-six million, nine hundred sixty-six thousand, five hundred forty-three".