1098138669809 has 2 divisors, whose sum is σ = 1098138669810. Its totient is φ = 1098138669808.

The previous prime is 1098138669799. The next prime is 1098138669869. The reversal of 1098138669809 is 9089668318901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 875482091584 + 222656578225 = 935672^2 + 471865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098138669809 - 2²⁸ = 1097870234353 is a prime.

It is not a weakly prime, because it can be changed into another prime (1098138669869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549069334904 + 549069334905.

It is an arithmetic number, because the mean of its divisors is an integer number (549069334905).

Almost surely, 2^{1098138669809} is an apocalyptic number.

It is an amenable number.

1098138669809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098138669809 is an equidigital number, since it uses as much as digits as its factorization.

1098138669809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40310784, while the sum is 68.

The spelling of 1098138669809 in words is "one trillion, ninety-eight billion, one hundred thirty-eight million, six hundred sixty-nine thousand, eight hundred nine".