1965560988817 has 2 divisors, whose sum is σ = 1965560988818. Its totient is φ = 1965560988816.

The previous prime is 1965560988791. The next prime is 1965560988889. The reversal of 1965560988817 is 7188890655691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1833963269121 + 131597719696 = 1354239^2 + 362764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965560988817 - 2³⁵ = 1931201250449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1965560988817.

It is not a weakly prime, because it can be changed into another prime (1965566988817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982780494408 + 982780494409.

It is an arithmetic number, because the mean of its divisors is an integer number (982780494409).

Almost surely, 2^{1965560988817} is an apocalyptic number.

It is an amenable number.

1965560988817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965560988817 is an equidigital number, since it uses as much as digits as its factorization.

1965560988817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 261273600, while the sum is 73.

The spelling of 1965560988817 in words is "one trillion, nine hundred sixty-five billion, five hundred sixty million, nine hundred eighty-eight thousand, eight hundred seventeen".