561116777798 has 24 divisors (see below), whose sum is σ = 853069990248. Its totient is φ = 276770658752.

The previous prime is 561116777797. The next prime is 561116777843. The reversal of 561116777798 is 897777611165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561116777797) 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, 99186986 + ... + 99192642.

It is an arithmetic number, because the mean of its divisors is an integer number (35544582927).

Almost surely, 2^561116777798 is an apocalyptic number.

561116777798 is a deficient number, since it is larger than the sum of its proper divisors (291953212450).

561116777798 is an frugal number, since it uses more digits than its factorization.

561116777798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7288 (or 6515 counting only the distinct ones).

The product of its digits is 31116960, while the sum is 65.

The spelling of 561116777798 in words is "five hundred sixty-one billion, one hundred sixteen million, seven hundred seventy-seven thousand, seven hundred ninety-eight".