7987816517 has 2 divisors, whose sum is σ = 7987816518. Its totient is φ = 7987816516.

The previous prime is 7987816493. The next prime is 7987816541. The reversal of 7987816517 is 7156187897.

7987816517 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (7987816493) and next prime (7987816541).

It can be written as a sum of positive squares in only one way, i.e., 5739729121 + 2248087396 = 75761^2 + 47414^2 .

It is a cyclic number.

It is not a de Polignac number, because 7987816517 - 2⁶ = 7987816453 is a prime.

It is a super-2 number, since 2×7987816517² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7987812517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3993908258 + 3993908259.

It is an arithmetic number, because the mean of its divisors is an integer number (3993908259).

Almost surely, 2^7987816517 is an apocalyptic number.

It is an amenable number.

7987816517 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987816517 is an equidigital number, since it uses as much as digits as its factorization.

7987816517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5927040, while the sum is 59.

The square root of 7987816517 is about 89374.5854088286. The cubic root of 7987816517 is about 1998.9841939063.

The spelling of 7987816517 in words is "seven billion, nine hundred eighty-seven million, eight hundred sixteen thousand, five hundred seventeen".