166643 has 2 divisors, whose sum is σ = 166644. Its totient is φ = 166642.

The previous prime is 166631. The next prime is 166657. The reversal of 166643 is 346661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166643 - 2⁴ = 166627 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83321 + 83322.

It is an arithmetic number, because the mean of its divisors is an integer number (83322).

2¹⁶⁶⁶⁴³ is an apocalyptic number.

166643 is a deficient number, since it is larger than the sum of its proper divisors (1).

166643 is an equidigital number, since it uses as much as digits as its factorization.

166643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 166643 is about 408.2193038062. The cubic root of 166643 is about 55.0295158379.

The spelling of 166643 in words is "one hundred sixty-six thousand, six hundred forty-three".