63643921434 has 24 divisors (see below), whose sum is σ = 138118680180. Its totient is φ = 21180253248.

The previous prime is 63643921433. The next prime is 63643921489. The reversal of 63643921434 is 43412934636.

63643921434 is a `hidden beast` number, since 63 + 64 + 392 + 143 + 4 = 666.

63643921434 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 59655620025 + 3988301409 = 244245^2 + 63153^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 63643921434.

It is not an unprimeable number, because it can be changed into a prime (63643921433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2854189 + ... + 2876400.

Almost surely, 2^63643921434 is an apocalyptic number.

63643921434 is an abundant number, since it is smaller than the sum of its proper divisors (74474758746).

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

63643921434 is a wasteful number, since it uses less digits than its factorization.

63643921434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731214 (or 5731211 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 45.

The spelling of 63643921434 in words is "sixty-three billion, six hundred forty-three million, nine hundred twenty-one thousand, four hundred thirty-four".