1028165987117 has 2 divisors, whose sum is σ = 1028165987118. Its totient is φ = 1028165987116.

The previous prime is 1028165987113. The next prime is 1028165987203. The reversal of 1028165987117 is 7117895618201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 974937037321 + 53228949796 = 987389^2 + 230714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028165987117 - 2² = 1028165987113 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028165987113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514082993558 + 514082993559.

It is an arithmetic number, because the mean of its divisors is an integer number (514082993559).

Almost surely, 2^{1028165987117} is an apocalyptic number.

It is an amenable number.

1028165987117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028165987117 is an equidigital number, since it uses as much as digits as its factorization.

1028165987117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 56.

The spelling of 1028165987117 in words is "one trillion, twenty-eight billion, one hundred sixty-five million, nine hundred eighty-seven thousand, one hundred seventeen".