63990013608 has 40 divisors (see below), whose sum is σ = 179231289930. Its totient is φ = 21330004320.

The previous prime is 63990013603. The next prime is 63990013639. The reversal of 63990013608 is 80631009936.

63990013608 is a `hidden beast` number, since 6 + 39 + 9 + 0 + 0 + 1 + 3 + 608 = 666.

63990013608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 33372713124 + 30617300484 = 182682^2 + 174978^2 .

It is not an unprimeable number, because it can be changed into a prime (63990013603) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 49374363 + ... + 49375658.

Almost surely, 2^63990013608 is an apocalyptic number.

It is an amenable number.

63990013608 is an abundant number, since it is smaller than the sum of its proper divisors (115241276322).

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

63990013608 is a wasteful number, since it uses less digits than its factorization.

63990013608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98750039 (or 98750026 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 63990013608 in words is "sixty-three billion, nine hundred ninety million, thirteen thousand, six hundred eight".