9996979987 has 2 divisors, whose sum is σ = 9996979988. Its totient is φ = 9996979986.

The previous prime is 9996979981. The next prime is 9996979997. The reversal of 9996979987 is 7899796999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9996979987 - 2⁷ = 9996979859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9996979987.

It is not a weakly prime, because it can be changed into another prime (9996979981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998489993 + 4998489994.

It is an arithmetic number, because the mean of its divisors is an integer number (4998489994).

Almost surely, 2^9996979987 is an apocalyptic number.

9996979987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9996979987 is an equidigital number, since it uses as much as digits as its factorization.

9996979987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1249949232, while the sum is 82.

The square root of 9996979987 is about 99984.8987947680. The cubic root of 9996979987 is about 2154.2177875031.

The spelling of 9996979987 in words is "nine billion, nine hundred ninety-six million, nine hundred seventy-nine thousand, nine hundred eighty-seven".