1965560988889 has 2 divisors, whose sum is σ = 1965560988890. Its totient is φ = 1965560988888.

The previous prime is 1965560988817. The next prime is 1965560988949. The reversal of 1965560988889 is 9888890655691.

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., 1925267251600 + 40293737289 = 1387540^2 + 200733^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965560988889 - 2³⁷ = 1828122035417 is a prime.

It is not a weakly prime, because it can be changed into another prime (1965560985889) 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, 982780494444 + 982780494445.

It is an arithmetic number, because the mean of its divisors is an integer number (982780494445).

Almost surely, 2^{1965560988889} is an apocalyptic number.

It is an amenable number.

1965560988889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965560988889 is an equidigital number, since it uses as much as digits as its factorization.

1965560988889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2687385600, while the sum is 82.

The spelling of 1965560988889 in words is "one trillion, nine hundred sixty-five billion, five hundred sixty million, nine hundred eighty-eight thousand, eight hundred eighty-nine".