636666412 has 18 divisors (see below), whose sum is σ = 1120286804. Its totient is φ = 316593960.

The previous prime is 636666403. The next prime is 636666413. The reversal of 636666412 is 214666636.

It is not an unprimeable number, because it can be changed into a prime (636666413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143743 + ... + 148105.

Almost surely, 2^636666412 is an apocalyptic number.

It is an amenable number.

636666412 is a deficient number, since it is larger than the sum of its proper divisors (483620392).

636666412 is a wasteful number, since it uses less digits than its factorization.

636666412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4749 (or 4556 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The square root of 636666412 is about 25232.2494439160. The cubic root of 636666412 is about 860.2750211090.

The spelling of 636666412 in words is "six hundred thirty-six million, six hundred sixty-six thousand, four hundred twelve".