561610056181 has 2 divisors, whose sum is σ = 561610056182. Its totient is φ = 561610056180.

The previous prime is 561610056143. The next prime is 561610056191. The reversal of 561610056181 is 181650016165.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305532562500 + 256077493681 = 552750^2 + 506041^2 .

It is a cyclic number.

It is not a de Polignac number, because 561610056181 - 2¹³ = 561610047989 is a prime.

It is a super-3 number, since 3×561610056181³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561610056191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280805028090 + 280805028091.

It is an arithmetic number, because the mean of its divisors is an integer number (280805028091).

Almost surely, 2^561610056181 is an apocalyptic number.

It is an amenable number.

561610056181 is a deficient number, since it is larger than the sum of its proper divisors (1).

561610056181 is an equidigital number, since it uses as much as digits as its factorization.

561610056181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 561610056181 in words is "five hundred sixty-one billion, six hundred ten million, fifty-six thousand, one hundred eighty-one".