166404443 has 2 divisors, whose sum is σ = 166404444. Its totient is φ = 166404442.

The previous prime is 166404437. The next prime is 166404463. The reversal of 166404443 is 344404661.

It is a weak prime.

It is an emirp because it is prime and its reverse (344404661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166404443 - 2²⁰ = 165355867 is a prime.

It is not a weakly prime, because it can be changed into another prime (166404463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83202221 + 83202222.

It is an arithmetic number, because the mean of its divisors is an integer number (83202222).

Almost surely, 2^166404443 is an apocalyptic number.

166404443 is a deficient number, since it is larger than the sum of its proper divisors (1).

166404443 is an equidigital number, since it uses as much as digits as its factorization.

166404443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 166404443 is about 12899.7846106049. The cubic root of 166404443 is about 550.0324421635.

The spelling of 166404443 in words is "one hundred sixty-six million, four hundred four thousand, four hundred forty-three".