63855228978 has 18 divisors (see below), whose sum is σ = 138355319037. Its totient is φ = 21284718960.

The previous prime is 63855228917. The next prime is 63855228979. The reversal of 63855228978 is 87982255836.

63855228978 is a `hidden beast` number, since 6 + 3 + 8 + 552 + 2 + 8 + 9 + 78 = 666.

63855228978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 34541337609 + 29313891369 = 185853^2 + 171213^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=178683.

It is not an unprimeable number, because it can be changed into a prime (63855228979) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1042318 + ... + 1101878.

Almost surely, 2^63855228978 is an apocalyptic number.

63855228978 is an abundant number, since it is smaller than the sum of its proper divisors (74500090059).

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

63855228978 is an frugal number, since it uses more digits than its factorization.

63855228978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119130 (or 59566 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 63.

The spelling of 63855228978 in words is "sixty-three billion, eight hundred fifty-five million, two hundred twenty-eight thousand, nine hundred seventy-eight".