63638784081 has 40 divisors (see below), whose sum is σ = 97373152800. Its totient is φ = 41406292800.

The previous prime is 63638784043. The next prime is 63638784103. The reversal of 63638784081 is 18048783636.

It is not a de Polignac number, because 63638784081 - 2⁷ = 63638783953 is a prime.

It is a super-2 number, since 2×63638784081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63638704081) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 616381 + ... + 712181.

It is an arithmetic number, because the mean of its divisors is an integer number (2434328820).

Almost surely, 2^63638784081 is an apocalyptic number.

It is an amenable number.

63638784081 is a deficient number, since it is larger than the sum of its proper divisors (33734368719).

63638784081 is a wasteful number, since it uses less digits than its factorization.

63638784081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96011 (or 96002 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 63638784081 in words is "sixty-three billion, six hundred thirty-eight million, seven hundred eighty-four thousand, eighty-one".