166816443 has 4 divisors (see below), whose sum is σ = 222421928. Its totient is φ = 111210960.

The previous prime is 166816367. The next prime is 166816453. The reversal of 166816443 is 344618661.

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

It is not a de Polignac number, because 166816443 - 2¹⁴ = 166800059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166816453) 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, 27802738 + ... + 27802743.

It is an arithmetic number, because the mean of its divisors is an integer number (55605482).

Almost surely, 2^166816443 is an apocalyptic number.

166816443 is a deficient number, since it is larger than the sum of its proper divisors (55605485).

166816443 is an equidigital number, since it uses as much as digits as its factorization.

166816443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55605484.

The product of its digits is 82944, while the sum is 39.

The square root of 166816443 is about 12915.7439971532. The cubic root of 166816443 is about 550.4860089779.

The spelling of 166816443 in words is "one hundred sixty-six million, eight hundred sixteen thousand, four hundred forty-three".