63978555199680 has 1008 divisors, whose sum is σ = 253920862540800. Its totient is φ = 14755084185600.

The previous prime is 63978555199631. The next prime is 63978555199697. The reversal of 63978555199680 is 8699155587936.

63978555199680 is a `hidden beast` number, since 6 + 3 + 9 + 7 + 8 + 5 + 5 + 519 + 96 + 8 + 0 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 63978555199680.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 637319731 + ... + 637420109.

It is an arithmetic number, because the mean of its divisors is an integer number (251905617600).

Almost surely, 2^{63978555199680} is an apocalyptic number.

63978555199680 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 63978555199680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126960431270400).

63978555199680 is an abundant number, since it is smaller than the sum of its proper divisors (189942307341120).

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

63978555199680 is a wasteful number, since it uses less digits than its factorization.

63978555199680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100514 (or 100490 counting only the distinct ones).

The product of its (nonzero) digits is 4408992000, while the sum is 81.

The spelling of 63978555199680 in words is "sixty-three trillion, nine hundred seventy-eight billion, five hundred fifty-five million, one hundred ninety-nine thousand, six hundred eighty".