9999889899 has 4 divisors (see below), whose sum is σ = 13333186536. Its totient is φ = 6666593264.

The previous prime is 9999889877. The next prime is 9999889901. The reversal of 9999889899 is 9989889999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9999889899 - 2⁸ = 9999889643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9999889819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666648314 + ... + 1666648319.

It is an arithmetic number, because the mean of its divisors is an integer number (3333296634).

Almost surely, 2^9999889899 is an apocalyptic number.

9999889899 is a deficient number, since it is larger than the sum of its proper divisors (3333296637).

9999889899 is a wasteful number, since it uses less digits than its factorization.

9999889899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333296636.

The product of its digits is 2448880128, while the sum is 87.

The square root of 9999889899 is about 99999.4494934847. The cubic root of 9999889899 is about 2154.4267831557.

The spelling of 9999889899 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-nine thousand, eight hundred ninety-nine".