561111728417 has 2 divisors, whose sum is σ = 561111728418. Its totient is φ = 561111728416.

The previous prime is 561111728279. The next prime is 561111728423. The reversal of 561111728417 is 714827111165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451905273121 + 109206455296 = 672239^2 + 330464^2 .

It is a cyclic number.

It is not a de Polignac number, because 561111728417 - 2³² = 556816761121 is a prime.

It is a super-3 number, since 3×561111728417³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (561111728467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280555864208 + 280555864209.

It is an arithmetic number, because the mean of its divisors is an integer number (280555864209).

Almost surely, 2^561111728417 is an apocalyptic number.

It is an amenable number.

561111728417 is a deficient number, since it is larger than the sum of its proper divisors (1).

561111728417 is an equidigital number, since it uses as much as digits as its factorization.

561111728417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 44.

The spelling of 561111728417 in words is "five hundred sixty-one billion, one hundred eleven million, seven hundred twenty-eight thousand, four hundred seventeen".