561863318632281 has 6 divisors (see below), whose sum is σ = 811580349135530. Its totient is φ = 374575545754848.

The previous prime is 561863318632249. The next prime is 561863318632283. The reversal of 561863318632281 is 182236813368165.

561863318632281 is a `hidden beast` number, since 5 + 6 + 1 + 8 + 6 + 3 + 318 + 6 + 32 + 281 = 666.

It can be written as a sum of positive squares in only one way, i.e., 335787886634256 + 226075431998025 = 18324516^2 + 15035805^2 .

It is not a de Polignac number, because 561863318632281 - 2⁵ = 561863318632249 is a prime.

It is a super-2 number, since 2×561863318632281² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561863318632283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31214628812896 + ... + 31214628812913.

Almost surely, 2^{561863318632281} is an apocalyptic number.

It is an amenable number.

561863318632281 is a deficient number, since it is larger than the sum of its proper divisors (249717030503249).

561863318632281 is a wasteful number, since it uses less digits than its factorization.

561863318632281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62429257625815 (or 62429257625812 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 561863318632281 in words is "five hundred sixty-one trillion, eight hundred sixty-three billion, three hundred eighteen million, six hundred thirty-two thousand, two hundred eighty-one".