1689809058869 has 2 divisors, whose sum is σ = 1689809058870. Its totient is φ = 1689809058868.

The previous prime is 1689809058851. The next prime is 1689809058937. The reversal of 1689809058869 is 9688509089861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1316671336369 + 373137722500 = 1147463^2 + 610850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1689809058869 is a prime.

It is a super-2 number, since 2×1689809058869² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1689809058869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689809057869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844904529434 + 844904529435.

It is an arithmetic number, because the mean of its divisors is an integer number (844904529435).

Almost surely, 2^{1689809058869} is an apocalyptic number.

It is an amenable number.

1689809058869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689809058869 is an equidigital number, since it uses as much as digits as its factorization.

1689809058869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 537477120, while the sum is 77.

The spelling of 1689809058869 in words is "one trillion, six hundred eighty-nine billion, eight hundred nine million, fifty-eight thousand, eight hundred sixty-nine".