63855426816 has 144 divisors (see below), whose sum is σ = 189332613120. Its totient is φ = 21228687360.

The previous prime is 63855426797. The next prime is 63855426821. The reversal of 63855426816 is 61862455836.

63855426816 is a `hidden beast` number, since 6 + 3 + 8 + 554 + 2 + 6 + 81 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2635236 + ... + 2659356.

Almost surely, 2^63855426816 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 63855426816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94666306560).

63855426816 is an abundant number, since it is smaller than the sum of its proper divisors (125477186304).

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

63855426816 is a wasteful number, since it uses less digits than its factorization.

63855426816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24529 (or 24509 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 63855426816 in words is "sixty-three billion, eight hundred fifty-five million, four hundred twenty-six thousand, eight hundred sixteen".