666970 has 8 divisors (see below), whose sum is σ = 1200564. Its totient is φ = 266784.

The previous prime is 666959. The next prime is 666979. The reversal of 666970 is 79666.

666970 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 552049 + 114921 = 743^2 + 339^2 .

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 (666979) by changing a digit.

666970 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33339 + ... + 33358.

2⁶⁶⁶⁹⁷⁰ is an apocalyptic number.

666970 is a deficient number, since it is larger than the sum of its proper divisors (533594).

666970 is a wasteful number, since it uses less digits than its factorization.

666970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66704.

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

The square root of 666970 is about 816.6823127753. The cubic root of 666970 is about 87.3712937684.

The spelling of 666970 in words is "six hundred sixty-six thousand, nine hundred seventy".