63643563 has 20 divisors (see below), whose sum is σ = 100667160. Its totient is φ = 39932352.

The previous prime is 63643519. The next prime is 63643577. The reversal of 63643563 is 36534636.

It is a happy number.

63643563 is a `hidden beast` number, since 6 + 3 + 643 + 5 + 6 + 3 = 666.

It is not a de Polignac number, because 63643563 - 2¹² = 63639467 is a prime.

It is a super-2 number, since 2×63643563² = 8101006222669938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63603563) 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 19 ways as a sum of consecutive naturals, for example, 21733 + ... + 24486.

It is an arithmetic number, because the mean of its divisors is an integer number (5033358).

Almost surely, 2^63643563 is an apocalyptic number.

63643563 is a deficient number, since it is larger than the sum of its proper divisors (37023597).

63643563 is a wasteful number, since it uses less digits than its factorization.

63643563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46248 (or 46239 counting only the distinct ones).

The product of its digits is 116640, while the sum is 36.

The square root of 63643563 is about 7977.6915834093. The cubic root of 63643563 is about 399.2560400836.

The spelling of 63643563 in words is "sixty-three million, six hundred forty-three thousand, five hundred sixty-three".