9996979998 has 48 divisors (see below), whose sum is σ = 21397858560. Its totient is φ = 3105056160.

The previous prime is 9996979997. The next prime is 9996980011. The reversal of 9996979998 is 8999796999.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 9996979998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9996979997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 412411 + ... + 435977.

It is an arithmetic number, because the mean of its divisors is an integer number (445788720).

Almost surely, 2^9996979998 is an apocalyptic number.

9996979998 is an abundant number, since it is smaller than the sum of its proper divisors (11400878562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9996979998 is a wasteful number, since it uses less digits than its factorization.

9996979998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23713 (or 23652 counting only the distinct ones).

The product of its digits is 1607077584, while the sum is 84.

The square root of 9996979998 is about 99984.8988497763. The cubic root of 9996979998 is about 2154.2177882932.

The spelling of 9996979998 in words is "nine billion, nine hundred ninety-six million, nine hundred seventy-nine thousand, nine hundred ninety-eight".