561727783349 has 2 divisors, whose sum is σ = 561727783350. Its totient is φ = 561727783348.

The previous prime is 561727783343. The next prime is 561727783361. The reversal of 561727783349 is 943387727165.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441972336100 + 119755447249 = 664810^2 + 346057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561727783349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561727783291 and 561727783300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561727783343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280863891674 + 280863891675.

It is an arithmetic number, because the mean of its divisors is an integer number (280863891675).

Almost surely, 2^561727783349 is an apocalyptic number.

It is an amenable number.

561727783349 is a deficient number, since it is larger than the sum of its proper divisors (1).

561727783349 is an equidigital number, since it uses as much as digits as its factorization.

561727783349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 62.

The spelling of 561727783349 in words is "five hundred sixty-one billion, seven hundred twenty-seven million, seven hundred eighty-three thousand, three hundred forty-nine".