166605673 has 8 divisors (see below), whose sum is σ = 183798216. Its totient is φ = 150038400.

The previous prime is 166605631. The next prime is 166605683. The reversal of 166605673 is 376506661.

It can be written as a sum of positive squares in 4 ways, for example, as 13638249 + 152967424 = 3693^2 + 12368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166605673 - 2⁹ = 166605161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166605683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155758 + ... + 156823.

It is an arithmetic number, because the mean of its divisors is an integer number (22974777).

Almost surely, 2^166605673 is an apocalyptic number.

166605673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

166605673 is a deficient number, since it is larger than the sum of its proper divisors (17192543).

166605673 is a wasteful number, since it uses less digits than its factorization.

166605673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312635.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 166605673 is about 12907.5819966406. The cubic root of 166605673 is about 550.2540677415.

The spelling of 166605673 in words is "one hundred sixty-six million, six hundred five thousand, six hundred seventy-three".