63689936856 has 128 divisors (see below), whose sum is σ = 196365120000. Its totient is φ = 16763397120.

The previous prime is 63689936831. The next prime is 63689936857. The reversal of 63689936856 is 65863998636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63689936857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1060596 + ... + 1119036.

It is an arithmetic number, because the mean of its divisors is an integer number (1534102500).

Almost surely, 2^63689936856 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 63689936856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98182560000).

63689936856 is an abundant number, since it is smaller than the sum of its proper divisors (132675183144).

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

63689936856 is a wasteful number, since it uses less digits than its factorization.

63689936856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58969 (or 58965 counting only the distinct ones).

The product of its digits is 302330880, while the sum is 69.

The spelling of 63689936856 in words is "sixty-three billion, six hundred eighty-nine million, nine hundred thirty-six thousand, eight hundred fifty-six".