79666 has 8 divisors (see below), whose sum is σ = 121644. Its totient is φ = 39120.

The previous prime is 79657. The next prime is 79669. The reversal of 79666 is 66697.

It can be written as a sum of positive squares in 2 ways, for example, as 65025 + 14641 = 255^2 + 121^2 .

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

It is not an unprimeable number, because it can be changed into a prime (79669) 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, 205 + ... + 448.

2⁷⁹⁶⁶⁶ is an apocalyptic number.

79666 is a deficient number, since it is larger than the sum of its proper divisors (41978).

79666 is a wasteful number, since it uses less digits than its factorization.

79666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716.

The product of its digits is 13608, while the sum is 34.

The square root of 79666 is about 282.2516607569. The cubic root of 79666 is about 43.0286450562.

The spelling of 79666 in words is "seventy-nine thousand, six hundred sixty-six".