561111672831 has 16 divisors (see below), whose sum is σ = 752109539424. Its totient is φ = 372094562304.

The previous prime is 561111672827. The next prime is 561111672851. The reversal of 561111672831 is 138276111165.

It is not a de Polignac number, because 561111672831 - 2² = 561111672827 is a prime.

It is a super-2 number, since 2×561111672831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561111672851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5634685 + ... + 5733401.

It is an arithmetic number, because the mean of its divisors is an integer number (47006846214).

Almost surely, 2^561111672831 is an apocalyptic number.

561111672831 is a deficient number, since it is larger than the sum of its proper divisors (190997866593).

561111672831 is a wasteful number, since it uses less digits than its factorization.

561111672831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108730.

The product of its digits is 60480, while the sum is 42.

Adding to 561111672831 its reverse (138276111165), we get a palindrome (699387783996).

The spelling of 561111672831 in words is "five hundred sixty-one billion, one hundred eleven million, six hundred seventy-two thousand, eight hundred thirty-one".