823563640563 has 4 divisors (see below), whose sum is σ = 1098084854088. Its totient is φ = 549042427040.

The previous prime is 823563640531. The next prime is 823563640567. The reversal of 823563640563 is 365046365328.

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 823563640563 - 2⁵ = 823563640531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (823563640567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137260606758 + ... + 137260606763.

It is an arithmetic number, because the mean of its divisors is an integer number (274521213522).

Almost surely, 2^823563640563 is an apocalyptic number.

823563640563 is a deficient number, since it is larger than the sum of its proper divisors (274521213525).

823563640563 is a wasteful number, since it uses less digits than its factorization.

823563640563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274521213524.

The product of its (nonzero) digits is 9331200, while the sum is 51.

The spelling of 823563640563 in words is "eight hundred twenty-three billion, five hundred sixty-three million, six hundred forty thousand, five hundred sixty-three".