561727777779 has 12 divisors (see below), whose sum is σ = 927296649136. Its totient is φ = 320987301552.

The previous prime is 561727777763. The next prime is 561727777811. The reversal of 561727777779 is 977777727165.

It is a happy number.

It is not a de Polignac number, because 561727777779 - 2⁴ = 561727777763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561727777729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4458156904 + ... + 4458157029.

Almost surely, 2^561727777779 is an apocalyptic number.

561727777779 is a deficient number, since it is larger than the sum of its proper divisors (365568871357).

561727777779 is a wasteful number, since it uses less digits than its factorization.

561727777779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8916313946 (or 8916313943 counting only the distinct ones).

The product of its digits is 444713220, while the sum is 72.

The spelling of 561727777779 in words is "five hundred sixty-one billion, seven hundred twenty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-nine".