563402623631621 has 4 divisors (see below), whose sum is σ = 563404635625644. Its totient is φ = 563400611637600.

The previous prime is 563402623631557. The next prime is 563402623631623. The reversal of 563402623631621 is 126136326204365.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 213048645746596 + 350353977885025 = 14596186^2 + 18717745^2 .

It is a cyclic number.

It is not a de Polignac number, because 563402623631621 - 2⁶ = 563402623631557 is a prime.

It is a super-2 number, since 2×563402623631621² (a number of 30 digits) contains 22 as substring.

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 563402623631621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (563402623631623) 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, 1005576920 + ... + 1006137041.

It is an arithmetic number, because the mean of its divisors is an integer number (140851158906411).

Almost surely, 2^{563402623631621} is an apocalyptic number.

It is an amenable number.

563402623631621 is a deficient number, since it is larger than the sum of its proper divisors (2011994023).

563402623631621 is a wasteful number, since it uses less digits than its factorization.

563402623631621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011994022.

The product of its (nonzero) digits is 5598720, while the sum is 50.

Adding to 563402623631621 its reverse (126136326204365), we get a palindrome (689538949835986).

The spelling of 563402623631621 in words is "five hundred sixty-three trillion, four hundred two billion, six hundred twenty-three million, six hundred thirty-one thousand, six hundred twenty-one".