4243440120961 has 2 divisors, whose sum is σ = 4243440120962. Its totient is φ = 4243440120960.

The previous prime is 4243440120943. The next prime is 4243440121021. The reversal of 4243440120961 is 1690210443424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3911930179600 + 331509941361 = 1977860^2 + 575769^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243440120961 - 2⁵ = 4243440120929 is a prime.

It is not a weakly prime, because it can be changed into another prime (4243440100961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121720060480 + 2121720060481.

It is an arithmetic number, because the mean of its divisors is an integer number (2121720060481).

Almost surely, 2^{4243440120961} is an apocalyptic number.

It is an amenable number.

4243440120961 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243440120961 is an equidigital number, since it uses as much as digits as its factorization.

4243440120961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 4243440120961 in words is "four trillion, two hundred forty-three billion, four hundred forty million, one hundred twenty thousand, nine hundred sixty-one".