845666 has 8 divisors (see below), whose sum is σ = 1299564. Its totient is φ = 412480.

The previous prime is 845659. The next prime is 845683. The reversal of 845666 is 666548.

It can be written as a sum of positive squares in 2 ways, for example, as 758641 + 87025 = 871^2 + 295^2 .

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

It is a congruent number.

It is an unprimeable number.

845666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 5075 + ... + 5238.

2⁸⁴⁵⁶⁶⁶ is an apocalyptic number.

845666 is a deficient number, since it is larger than the sum of its proper divisors (453898).

845666 is a wasteful number, since it uses less digits than its factorization.

845666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10356.

The product of its digits is 34560, while the sum is 35.

The square root of 845666 is about 919.6010004344. The cubic root of 845666 is about 94.5655508540.

It can be divided in two parts, 8456 and 66, that multiplied together give a triangular number (558096 = T₁₀₅₆).

The spelling of 845666 in words is "eight hundred forty-five thousand, six hundred sixty-six".