42116105561 has 2 divisors, whose sum is σ = 42116105562. Its totient is φ = 42116105560.

The previous prime is 42116105557. The next prime is 42116105639. The reversal of 42116105561 is 16550161124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41992206400 + 123899161 = 204920^2 + 11131^2 .

It is a cyclic number.

It is not a de Polignac number, because 42116105561 - 2² = 42116105557 is a prime.

It is not a weakly prime, because it can be changed into another prime (42116101561) 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, 21058052780 + 21058052781.

It is an arithmetic number, because the mean of its divisors is an integer number (21058052781).

Almost surely, 2^42116105561 is an apocalyptic number.

It is an amenable number.

42116105561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42116105561 is an equidigital number, since it uses as much as digits as its factorization.

42116105561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 42116105561 its reverse (16550161124), we get a palindrome (58666266685).

The spelling of 42116105561 in words is "forty-two billion, one hundred sixteen million, one hundred five thousand, five hundred sixty-one".