166716673 has 4 divisors (see below), whose sum is σ = 173965248. Its totient is φ = 159468100.

The previous prime is 166716643. The next prime is 166716749. The reversal of 166716673 is 376617661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166716673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166716643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3624253 + ... + 3624298.

It is an arithmetic number, because the mean of its divisors is an integer number (43491312).

Almost surely, 2^166716673 is an apocalyptic number.

It is an amenable number.

166716673 is a deficient number, since it is larger than the sum of its proper divisors (7248575).

166716673 is an equidigital number, since it uses as much as digits as its factorization.

166716673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248574.

The product of its digits is 190512, while the sum is 43.

The square root of 166716673 is about 12911.8810790682. The cubic root of 166716673 is about 550.3762417370.

It can be divided in two parts, 16671667 and 3, that multiplied together give a triangular number (50015001 = T₁₀₀₀₁).

The spelling of 166716673 in words is "one hundred sixty-six million, seven hundred sixteen thousand, six hundred seventy-three".