63551371968 has 168 divisors, whose sum is σ = 208519450880. Its totient is φ = 18128033280.

The previous prime is 63551371927. The next prime is 63551371979. The reversal of 63551371968 is 86917315536.

63551371968 is a `hidden beast` number, since 6 + 35 + 513 + 7 + 1 + 96 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2531703 + ... + 2556681.

Almost surely, 2^63551371968 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 63551371968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104259725440).

63551371968 is an abundant number, since it is smaller than the sum of its proper divisors (144968078912).

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

63551371968 is a wasteful number, since it uses less digits than its factorization.

63551371968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25635 (or 25622 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The spelling of 63551371968 in words is "sixty-three billion, five hundred fifty-one million, three hundred seventy-one thousand, nine hundred sixty-eight".