1680554042917 has 2 divisors, whose sum is σ = 1680554042918. Its totient is φ = 1680554042916.

The previous prime is 1680554042903. The next prime is 1680554042927. The reversal of 1680554042917 is 7192404550861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1192112401921 + 488441640996 = 1091839^2 + 698886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680554042917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680554042927) 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, 840277021458 + 840277021459.

It is an arithmetic number, because the mean of its divisors is an integer number (840277021459).

Almost surely, 2^{1680554042917} is an apocalyptic number.

It is an amenable number.

1680554042917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680554042917 is an equidigital number, since it uses as much as digits as its factorization.

1680554042917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 1680554042917 in words is "one trillion, six hundred eighty billion, five hundred fifty-four million, forty-two thousand, nine hundred seventeen".