561550000621 has 2 divisors, whose sum is σ = 561550000622. Its totient is φ = 561550000620.

The previous prime is 561550000607. The next prime is 561550000651. The reversal of 561550000621 is 126000055165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 560872179396 + 677821225 = 748914^2 + 26035^2 .

It is a cyclic number.

It is not a de Polignac number, because 561550000621 - 2⁵ = 561550000589 is a prime.

It is a super-3 number, since 3×561550000621³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561550000651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280775000310 + 280775000311.

It is an arithmetic number, because the mean of its divisors is an integer number (280775000311).

Almost surely, 2^561550000621 is an apocalyptic number.

It is an amenable number.

561550000621 is a deficient number, since it is larger than the sum of its proper divisors (1).

561550000621 is an equidigital number, since it uses as much as digits as its factorization.

561550000621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 561550000621 its reverse (126000055165), we get a palindrome (687550055786).

The spelling of 561550000621 in words is "five hundred sixty-one billion, five hundred fifty million, six hundred twenty-one", and thus it is an aban number.