63168421638 has 48 divisors (see below), whose sum is σ = 147014990064. Its totient is φ = 18041768640.

The previous prime is 63168421607. The next prime is 63168421699. The reversal of 63168421638 is 83612486136.

63168421638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×63168421638² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 833028 + ... + 905688.

It is an arithmetic number, because the mean of its divisors is an integer number (3062812293).

Almost surely, 2^63168421638 is an apocalyptic number.

63168421638 is an abundant number, since it is smaller than the sum of its proper divisors (83846568426).

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

63168421638 is a wasteful number, since it uses less digits than its factorization.

63168421638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75637 (or 75630 counting only the distinct ones).

The product of its digits is 995328, while the sum is 48.

The spelling of 63168421638 in words is "sixty-three billion, one hundred sixty-eight million, four hundred twenty-one thousand, six hundred thirty-eight".