563663821 has 8 divisors (see below), whose sum is σ = 644720384. Its totient is φ = 482740560.

The previous prime is 563663819. The next prime is 563663827. The reversal of 563663821 is 128366365.

563663821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 563663821 - 2¹ = 563663819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (563663827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24090 + ... + 41323.

It is an arithmetic number, because the mean of its divisors is an integer number (80590048).

Almost surely, 2^563663821 is an apocalyptic number.

It is an amenable number.

563663821 is a deficient number, since it is larger than the sum of its proper divisors (81056563).

563663821 is a wasteful number, since it uses less digits than its factorization.

563663821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66651.

The product of its digits is 155520, while the sum is 40.

The square root of 563663821 is about 23741.6052742859. The cubic root of 563663821 is about 826.0507314842.

The spelling of 563663821 in words is "five hundred sixty-three million, six hundred sixty-three thousand, eight hundred twenty-one".