63521023664 has 20 divisors (see below), whose sum is σ = 140653695504. Its totient is φ = 27223295808.

The previous prime is 63521023633. The next prime is 63521023691. The reversal of 63521023664 is 46632012536.

It is a happy number.

63521023664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283575887 + ... + 283576110.

Almost surely, 2^63521023664 is an apocalyptic number.

It is an amenable number.

63521023664 is an abundant number, since it is smaller than the sum of its proper divisors (77132671840).

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

63521023664 is a wasteful number, since it uses less digits than its factorization.

63521023664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567152012 (or 567152006 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 63521023664 in words is "sixty-three billion, five hundred twenty-one million, twenty-three thousand, six hundred sixty-four".