42116656889 has 2 divisors, whose sum is σ = 42116656890. Its totient is φ = 42116656888.

The previous prime is 42116656871. The next prime is 42116656943. The reversal of 42116656889 is 98865661124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40547863225 + 1568793664 = 201365^2 + 39608^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42116656889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42116656189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21058328444 + 21058328445.

It is an arithmetic number, because the mean of its divisors is an integer number (21058328445).

Almost surely, 2^42116656889 is an apocalyptic number.

It is an amenable number.

42116656889 is a deficient number, since it is larger than the sum of its proper divisors (1).

42116656889 is an equidigital number, since it uses as much as digits as its factorization.

42116656889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 56.

The spelling of 42116656889 in words is "forty-two billion, one hundred sixteen million, six hundred fifty-six thousand, eight hundred eighty-nine".