66706 has 4 divisors (see below), whose sum is σ = 100062. Its totient is φ = 33352.

The previous prime is 66701. The next prime is 66713. The reversal of 66706 is 60766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65025 + 1681 = 255^2 + 41^2 .

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (66701) by changing a digit.

66706 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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16675 + ... + 16678.

2⁶⁶⁷⁰⁶ is an apocalyptic number.

66706 is a deficient number, since it is larger than the sum of its proper divisors (33356).

66706 is a wasteful number, since it uses less digits than its factorization.

66706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33355.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 66706 is about 258.2750471881. The cubic root of 66706 is about 40.5559861786. Note that the first 3 decimals are identical.

The spelling of 66706 in words is "sixty-six thousand, seven hundred six".