636646636 has 12 divisors (see below), whose sum is σ = 1116194800. Its totient is φ = 317733840.

The previous prime is 636646613. The next prime is 636646643.

636646636 is nontrivially palindromic in base 10.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144936 + ... + 149263.

Almost surely, 2^636646636 is an apocalyptic number.

It is an amenable number.

636646636 is a deficient number, since it is larger than the sum of its proper divisors (479548164).

636646636 is a wasteful number, since it uses less digits than its factorization.

636646636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294744 (or 294742 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 46.

The square root of 636646636 is about 25231.8575614242. The cubic root of 636646636 is about 860.2661137887.

The spelling of 636646636 in words is "six hundred thirty-six million, six hundred forty-six thousand, six hundred thirty-six".