561727783361 has 2 divisors, whose sum is σ = 561727783362. Its totient is φ = 561727783360.

The previous prime is 561727783349. The next prime is 561727783367. The reversal of 561727783361 is 163387727165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 557029366336 + 4698417025 = 746344^2 + 68545^2 .

It is a cyclic number.

It is not a de Polignac number, because 561727783361 - 2³⁰ = 560654041537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561727783297 and 561727783306.

It is not a weakly prime, because it can be changed into another prime (561727783367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280863891680 + 280863891681.

It is an arithmetic number, because the mean of its divisors is an integer number (280863891681).

Almost surely, 2^561727783361 is an apocalyptic number.

It is an amenable number.

561727783361 is a deficient number, since it is larger than the sum of its proper divisors (1).

561727783361 is an equidigital number, since it uses as much as digits as its factorization.

561727783361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 56.

The spelling of 561727783361 in words is "five hundred sixty-one billion, seven hundred twenty-seven million, seven hundred eighty-three thousand, three hundred sixty-one".