166205843 has 4 divisors (see below), whose sum is σ = 173432208. Its totient is φ = 158979480.

The previous prime is 166205807. The next prime is 166205861. The reversal of 166205843 is 348502661.

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 166205843 - 2⁶ = 166205779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166205803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3613148 + ... + 3613193.

It is an arithmetic number, because the mean of its divisors is an integer number (43358052).

Almost surely, 2^166205843 is an apocalyptic number.

166205843 is a deficient number, since it is larger than the sum of its proper divisors (7226365).

166205843 is an equidigital number, since it uses as much as digits as its factorization.

166205843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7226364.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 166205843 is about 12892.0845094965. The cubic root of 166205843 is about 549.8135378943.

The spelling of 166205843 in words is "one hundred sixty-six million, two hundred five thousand, eight hundred forty-three".