864536563 has 4 divisors (see below), whose sum is σ = 943130808. Its totient is φ = 785942320.

The previous prime is 864536557. The next prime is 864536593. The reversal of 864536563 is 365635468.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 864536563 - 2⁵ = 864536531 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (864536593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39297106 + ... + 39297127.

It is an arithmetic number, because the mean of its divisors is an integer number (235782702).

Almost surely, 2^864536563 is an apocalyptic number.

864536563 is a deficient number, since it is larger than the sum of its proper divisors (78594245).

864536563 is a wasteful number, since it uses less digits than its factorization.

864536563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78594244.

The product of its digits is 1555200, while the sum is 46.

The square root of 864536563 is about 29403.0026187803. The cubic root of 864536563 is about 952.6377525733.

The spelling of 864536563 in words is "eight hundred sixty-four million, five hundred thirty-six thousand, five hundred sixty-three".