9987996653 has 2 divisors, whose sum is σ = 9987996654. Its totient is φ = 9987996652.

The previous prime is 9987996643. The next prime is 9987996679. The reversal of 9987996653 is 3566997899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8097660169 + 1890336484 = 89987^2 + 43478^2 .

It is an emirp because it is prime and its reverse (3566997899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9987996653 - 2¹⁰ = 9987995629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9987996643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993998326 + 4993998327.

It is an arithmetic number, because the mean of its divisors is an integer number (4993998327).

Almost surely, 2^9987996653 is an apocalyptic number.

It is an amenable number.

9987996653 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987996653 is an equidigital number, since it uses as much as digits as its factorization.

9987996653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198404640, while the sum is 71.

The square root of 9987996653 is about 99939.9652441404. The cubic root of 9987996653 is about 2153.5723306607.

The spelling of 9987996653 in words is "nine billion, nine hundred eighty-seven million, nine hundred ninety-six thousand, six hundred fifty-three".