166006805 has 8 divisors (see below), whose sum is σ = 201447000. Its totient is φ = 131312896.

The previous prime is 166006793. The next prime is 166006807. The reversal of 166006805 is 508600661.

It can be written as a sum of positive squares in 4 ways, for example, as 4157521 + 161849284 = 2039^2 + 12722^2 .

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 166006805 - 2⁸ = 166006549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166006807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186080 + ... + 186969.

It is an arithmetic number, because the mean of its divisors is an integer number (25180875).

Almost surely, 2^166006805 is an apocalyptic number.

It is an amenable number.

166006805 is a deficient number, since it is larger than the sum of its proper divisors (35440195).

166006805 is an equidigital number, since it uses as much as digits as its factorization.

166006805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373143.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 166006805 is about 12884.3628092351. The cubic root of 166006805 is about 549.5939758183.

The spelling of 166006805 in words is "one hundred sixty-six million, six thousand, eight hundred five".