561004320204621 has 6 divisors (see below), whose sum is σ = 810339573628910. Its totient is φ = 374002880136408.

The previous prime is 561004320204589. The next prime is 561004320204641. The reversal of 561004320204621 is 126402023400165.

561004320204621 is a `hidden beast` number, since 5 + 6 + 1 + 0 + 0 + 4 + 3 + 2 + 0 + 20 + 4 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 528978794212521 + 32025525992100 = 22999539^2 + 5659110^2 .

It is not a de Polignac number, because 561004320204621 - 2⁵ = 561004320204589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561004320204641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31166906678026 + ... + 31166906678043.

Almost surely, 2^{561004320204621} is an apocalyptic number.

It is an amenable number.

561004320204621 is a deficient number, since it is larger than the sum of its proper divisors (249335253424289).

561004320204621 is a wasteful number, since it uses less digits than its factorization.

561004320204621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62333813356075 (or 62333813356072 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 561004320204621 its reverse (126402023400165), we get a palindrome (687406343604786).

The spelling of 561004320204621 in words is "five hundred sixty-one trillion, four billion, three hundred twenty million, two hundred four thousand, six hundred twenty-one".