63987794665712 has 320 divisors, whose sum is σ = 138452538470400. Its totient is φ = 28543972638720.

The previous prime is 63987794665709. The next prime is 63987794665777. The reversal of 63987794665712 is 21756649778936.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39328699043 + ... + 39328700669.

It is an arithmetic number, because the mean of its divisors is an integer number (432664182720).

Almost surely, 2^{63987794665712} 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 63987794665712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69226269235200).

63987794665712 is an abundant number, since it is smaller than the sum of its proper divisors (74464743804688).

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

63987794665712 is a wasteful number, since it uses less digits than its factorization.

63987794665712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704 (or 2698 counting only the distinct ones).

The product of its digits is 5761082880, while the sum is 80.

The spelling of 63987794665712 in words is "sixty-three trillion, nine hundred eighty-seven billion, seven hundred ninety-four million, six hundred sixty-five thousand, seven hundred twelve".