561116423001961 has 2 divisors, whose sum is σ = 561116423001962. Its totient is φ = 561116423001960.

The previous prime is 561116423001947. The next prime is 561116423002073. The reversal of 561116423001961 is 169100324611165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538983538208361 + 22132884793600 = 23216019^2 + 4704560^2 .

It is a cyclic number.

It is not a de Polignac number, because 561116423001961 - 2¹³ = 561116422993769 is a prime.

It is a super-2 number, since 2×561116423001961² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561116423001941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280558211500980 + 280558211500981.

It is an arithmetic number, because the mean of its divisors is an integer number (280558211500981).

Almost surely, 2^{561116423001961} is an apocalyptic number.

It is an amenable number.

561116423001961 is a deficient number, since it is larger than the sum of its proper divisors (1).

561116423001961 is an equidigital number, since it uses as much as digits as its factorization.

561116423001961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 561116423001961 in words is "five hundred sixty-one trillion, one hundred sixteen billion, four hundred twenty-three million, one thousand, nine hundred sixty-one".