166389005 has 8 divisors (see below), whose sum is σ = 199738872. Its totient is φ = 133063168.

The previous prime is 166388953. The next prime is 166389011. The reversal of 166389005 is 500983661.

It can be written as a sum of positive squares in 4 ways, for example, as 417316 + 165971689 = 646^2 + 12883^2 .

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 166389005 - 2⁶ = 166388941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166389005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17849 + ... + 25521.

It is an arithmetic number, because the mean of its divisors is an integer number (24967359).

Almost surely, 2^166389005 is an apocalyptic number.

It is an amenable number.

166389005 is a deficient number, since it is larger than the sum of its proper divisors (33349867).

166389005 is an equidigital number, since it uses as much as digits as its factorization.

166389005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12015.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 166389005 is about 12899.1862146416. The cubic root of 166389005 is about 550.0154320739.

The spelling of 166389005 in words is "one hundred sixty-six million, three hundred eighty-nine thousand, five".