636221605116 has 12 divisors (see below), whose sum is σ = 1484517078632. Its totient is φ = 212073868368.

The previous prime is 636221605111. The next prime is 636221605121. The reversal of 636221605116 is 611506122636.

It is an interprime number because it is at equal distance from previous prime (636221605111) and next prime (636221605121).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636221605111) by changing a digit.

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, 26509233535 + ... + 26509233558.

Almost surely, 2^636221605116 is an apocalyptic number.

It is an amenable number.

636221605116 is an abundant number, since it is smaller than the sum of its proper divisors (848295473516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636221605116 is a wasteful number, since it uses less digits than its factorization.

636221605116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53018467100 (or 53018467098 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 636221605116 in words is "six hundred thirty-six billion, two hundred twenty-one million, six hundred five thousand, one hundred sixteen".