80666 has 8 divisors (see below), whose sum is σ = 123444. Its totient is φ = 39520.

The previous prime is 80657. The next prime is 80669. The reversal of 80666 is 66608.

It can be written as a sum of positive squares in 2 ways, for example, as 75625 + 5041 = 275^2 + 71^2 .

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

80666 is a modest number, since divided by 666 gives 80 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80669) 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, 275 + ... + 486.

2⁸⁰⁶⁶⁶ is an apocalyptic number.

80666 is a deficient number, since it is larger than the sum of its proper divisors (42778).

80666 is a wasteful number, since it uses less digits than its factorization.

80666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 80666 is about 284.0176050881. The cubic root of 80666 is about 43.2079346422.

The spelling of 80666 in words is "eighty thousand, six hundred sixty-six".