665970212 has 12 divisors (see below), whose sum is σ = 1166081280. Its totient is φ = 332804136.

The previous prime is 665970211. The next prime is 665970259. The reversal of 665970212 is 212079566.

It is a happy number.

665970212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (665970211) 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, 36788 + ... + 51819.

It is an arithmetic number, because the mean of its divisors is an integer number (97173440).

Almost surely, 2^665970212 is an apocalyptic number.

It is an amenable number.

665970212 is a deficient number, since it is larger than the sum of its proper divisors (500111068).

665970212 is a wasteful number, since it uses less digits than its factorization.

665970212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90490 (or 90488 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 665970212 is about 25806.3986638973. The cubic root of 665970212 is about 873.2761541467.

The spelling of 665970212 in words is "six hundred sixty-five million, nine hundred seventy thousand, two hundred twelve".