561116166723 has 20 divisors (see below), whose sum is σ = 957954938160. Its totient is φ = 320637809232.

The previous prime is 561116166719. The next prime is 561116166757. The reversal of 561116166723 is 327661611165.

561116166723 is a `hidden beast` number, since 5 + 6 + 1 + 1 + 1 + 616 + 6 + 7 + 23 = 666.

It is not a de Polignac number, because 561116166723 - 2² = 561116166719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561116166703) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 494810868 + ... + 494812001.

It is an arithmetic number, because the mean of its divisors is an integer number (47897746908).

Almost surely, 2^561116166723 is an apocalyptic number.

561116166723 is a deficient number, since it is larger than the sum of its proper divisors (396838771437).

561116166723 is an equidigital number, since it uses as much as digits as its factorization.

561116166723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989622888 (or 989622879 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

Adding to 561116166723 its reverse (327661611165), we get a palindrome (888777777888).

The spelling of 561116166723 in words is "five hundred sixty-one billion, one hundred sixteen million, one hundred sixty-six thousand, seven hundred twenty-three".