166681323 has 6 divisors (see below), whose sum is σ = 240761924. Its totient is φ = 111120876.

The previous prime is 166681321. The next prime is 166681331. The reversal of 166681323 is 323186661.

It is not a de Polignac number, because 166681323 - 2¹ = 166681321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166681321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9260065 + ... + 9260082.

Almost surely, 2^166681323 is an apocalyptic number.

166681323 is a deficient number, since it is larger than the sum of its proper divisors (74080601).

166681323 is a wasteful number, since it uses less digits than its factorization.

166681323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18520153 (or 18520150 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 166681323 is about 12910.5121122285. The cubic root of 166681323 is about 550.3373390584.

The spelling of 166681323 in words is "one hundred sixty-six million, six hundred eighty-one thousand, three hundred twenty-three".