1663077919817 has 2 divisors, whose sum is σ = 1663077919818. Its totient is φ = 1663077919816.

The previous prime is 1663077919801. The next prime is 1663077919879. The reversal of 1663077919817 is 7189197703661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1662562675216 + 515244601 = 1289404^2 + 22699^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663077919817 - 2⁴ = 1663077919801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1663017919817) 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, 831538959908 + 831538959909.

It is an arithmetic number, because the mean of its divisors is an integer number (831538959909).

Almost surely, 2^{1663077919817} is an apocalyptic number.

It is an amenable number.

1663077919817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663077919817 is an equidigital number, since it uses as much as digits as its factorization.

1663077919817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24004512, while the sum is 65.

The spelling of 1663077919817 in words is "one trillion, six hundred sixty-three billion, seventy-seven million, nine hundred nineteen thousand, eight hundred seventeen".