561111728279 has 2 divisors, whose sum is σ = 561111728280. Its totient is φ = 561111728278.

The previous prime is 561111728213. The next prime is 561111728417. The reversal of 561111728279 is 972827111165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561111728279 - 2³⁶ = 492392251543 is a prime.

It is a super-2 number, since 2×561111728279² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561111728479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280555864139 + 280555864140.

It is an arithmetic number, because the mean of its divisors is an integer number (280555864140).

Almost surely, 2^561111728279 is an apocalyptic number.

561111728279 is a deficient number, since it is larger than the sum of its proper divisors (1).

561111728279 is an equidigital number, since it uses as much as digits as its factorization.

561111728279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 50.

The spelling of 561111728279 in words is "five hundred sixty-one billion, one hundred eleven million, seven hundred twenty-eight thousand, two hundred seventy-nine".