63638686332 has 72 divisors (see below), whose sum is σ = 173625051600. Its totient is φ = 19537459200.

The previous prime is 63638686327. The next prime is 63638686339. The reversal of 63638686332 is 23368683636.

63638686332 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 2×63638686332² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63638686339) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58707 + ... + 361557.

It is an arithmetic number, because the mean of its divisors is an integer number (2411459050).

Almost surely, 2^63638686332 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 63638686332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86812525800).

63638686332 is an abundant number, since it is smaller than the sum of its proper divisors (109986365268).

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

63638686332 is a wasteful number, since it uses less digits than its factorization.

63638686332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303323 (or 303318 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 54.

The spelling of 63638686332 in words is "sixty-three billion, six hundred thirty-eight million, six hundred eighty-six thousand, three hundred thirty-two".