63855563 has 12 divisors (see below), whose sum is σ = 66030792. Its totient is φ = 61746720.

The previous prime is 63855551. The next prime is 63855643. The reversal of 63855563 is 36555836.

It is a de Polignac number, because none of the positive numbers 2^k-63855563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63855563.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63855503) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 302528 + ... + 302738.

It is an arithmetic number, because the mean of its divisors is an integer number (5502566).

Almost surely, 2^63855563 is an apocalyptic number.

63855563 is a deficient number, since it is larger than the sum of its proper divisors (2175229).

63855563 is a wasteful number, since it uses less digits than its factorization.

63855563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 395 counting only the distinct ones).

The product of its digits is 324000, while the sum is 41.

The square root of 63855563 is about 7990.9675884714. The cubic root of 63855563 is about 399.6988629314.

The spelling of 63855563 in words is "sixty-three million, eight hundred fifty-five thousand, five hundred sixty-three".