10503205561 has 2 divisors, whose sum is σ = 10503205562. Its totient is φ = 10503205560.

The previous prime is 10503205541. The next prime is 10503205571. The reversal of 10503205561 is 16550230501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5720653225 + 4782552336 = 75635^2 + 69156^2 .

It is a cyclic number.

It is not a de Polignac number, because 10503205561 - 2⁹ = 10503205049 is a prime.

It is a super-2 number, since 2×10503205561² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10503205541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5251602780 + 5251602781.

It is an arithmetic number, because the mean of its divisors is an integer number (5251602781).

Almost surely, 2^10503205561 is an apocalyptic number.

It is an amenable number.

10503205561 is a deficient number, since it is larger than the sum of its proper divisors (1).

10503205561 is an equidigital number, since it uses as much as digits as its factorization.

10503205561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 10503205561 in words is "ten billion, five hundred three million, two hundred five thousand, five hundred sixty-one".