63978998385600 has 2268 divisors, whose sum is σ = 251842309542720. Its totient is φ = 15977851084800.

The previous prime is 63978998385551. The next prime is 63978998385611. The reversal of 63978998385600 is 658389987936.

63978998385600 is a `hidden beast` number, since 6 + 3 + 97 + 8 + 9 + 98 + 385 + 60 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 63978998385600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 323 ways as a sum of consecutive naturals, for example, 718865150356 + ... + 718865150444.

Almost surely, 2^{63978998385600} is an apocalyptic number.

63978998385600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63978998385600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125921154771360).

63978998385600 is an abundant number, since it is smaller than the sum of its proper divisors (187863311157120).

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

63978998385600 is an frugal number, since it uses more digits than its factorization.

63978998385600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 4232632320, while the sum is 81.

The spelling of 63978998385600 in words is "sixty-three trillion, nine hundred seventy-eight billion, nine hundred ninety-eight million, three hundred eighty-five thousand, six hundred".