5561105554981 has 2 divisors, whose sum is σ = 5561105554982. Its totient is φ = 5561105554980.

The previous prime is 5561105554889. The next prime is 5561105555017. The reversal of 5561105554981 is 1894555011655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5553327902500 + 7777652481 = 2356550^2 + 88191^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561105554981 - 2¹⁹ = 5561105030693 is a prime.

It is a super-2 number, since 2×5561105554981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5561105557981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780552777490 + 2780552777491.

It is an arithmetic number, because the mean of its divisors is an integer number (2780552777491).

Almost surely, 2^{5561105554981} is an apocalyptic number.

It is an amenable number.

5561105554981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561105554981 is an equidigital number, since it uses as much as digits as its factorization.

5561105554981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400000, while the sum is 55.

The spelling of 5561105554981 in words is "five trillion, five hundred sixty-one billion, one hundred five million, five hundred fifty-four thousand, nine hundred eighty-one".