63636128656 has 60 divisors (see below), whose sum is σ = 128247513732. Its totient is φ = 30587533312.

The previous prime is 63636128641. The next prime is 63636128663. The reversal of 63636128656 is 65682163636.

It can be written as a sum of positive squares in 6 ways, for example, as 1343955600 + 62292173056 = 36660^2 + 249584^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3125100 + ... + 3145396.

Almost surely, 2^63636128656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63636128656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64123756866).

63636128656 is an abundant number, since it is smaller than the sum of its proper divisors (64611385076).

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

63636128656 is a wasteful number, since it uses less digits than its factorization.

63636128656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20596 (or 20561 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 52.

The spelling of 63636128656 in words is "sixty-three billion, six hundred thirty-six million, one hundred twenty-eight thousand, six hundred fifty-six".