1655890489717 has 2 divisors, whose sum is σ = 1655890489718. Its totient is φ = 1655890489716.

The previous prime is 1655890489699. The next prime is 1655890489723. The reversal of 1655890489717 is 7179840985561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1182930315876 + 472960173841 = 1087626^2 + 687721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1655890489717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655890489727) 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, 827945244858 + 827945244859.

It is an arithmetic number, because the mean of its divisors is an integer number (827945244859).

Almost surely, 2^{1655890489717} is an apocalyptic number.

It is an amenable number.

1655890489717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655890489717 is an equidigital number, since it uses as much as digits as its factorization.

1655890489717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 152409600, while the sum is 70.

The spelling of 1655890489717 in words is "one trillion, six hundred fifty-five billion, eight hundred ninety million, four hundred eighty-nine thousand, seven hundred seventeen".