63995634720 has 144 divisors (see below), whose sum is σ = 218562140160. Its totient is φ = 17051668992.

The previous prime is 63995634701. The next prime is 63995634721. The reversal of 63995634720 is 2743659936.

63995634720 is a `hidden beast` number, since 6 + 3 + 9 + 9 + 563 + 4 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (63995634721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1824387 + ... + 1859133.

It is an arithmetic number, because the mean of its divisors is an integer number (1517792640).

Almost surely, 2^63995634720 is an apocalyptic number.

63995634720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63995634720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109281070080).

63995634720 is an abundant number, since it is smaller than the sum of its proper divisors (154566505440).

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

63995634720 is a wasteful number, since it uses less digits than its factorization.

63995634720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36047 (or 36036 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 54.

The spelling of 63995634720 in words is "sixty-three billion, nine hundred ninety-five million, six hundred thirty-four thousand, seven hundred twenty".