636666970 has 8 divisors (see below), whose sum is σ = 1146000564. Its totient is φ = 254666784.

The previous prime is 636666967. The next prime is 636666971. The reversal of 636666970 is 79666636.

It is a happy number.

636666970 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 630863689 + 5803281 = 25117^2 + 2409^2 .

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 (636666971) 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, 31833339 + ... + 31833358.

Almost surely, 2^636666970 is an apocalyptic number.

636666970 is a deficient number, since it is larger than the sum of its proper divisors (509333594).

636666970 is a wasteful number, since it uses less digits than its factorization.

636666970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63666704.

The product of its (nonzero) digits is 1469664, while the sum is 49.

The square root of 636666970 is about 25232.2605011917. The cubic root of 636666970 is about 860.2752724355.

The spelling of 636666970 in words is "six hundred thirty-six million, six hundred sixty-six thousand, nine hundred seventy".