99999199988 has 12 divisors (see below), whose sum is σ = 175091747040. Its totient is φ = 49972986552.

The previous prime is 99999199987. The next prime is 99999199999. The reversal of 99999199988 is 88999199999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999199987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6644906 + ... + 6659937.

It is an arithmetic number, because the mean of its divisors is an integer number (14590978920).

Almost surely, 2^99999199988 is an apocalyptic number.

It is an amenable number.

99999199988 is a deficient number, since it is larger than the sum of its proper divisors (75092547052).

99999199988 is a wasteful number, since it uses less digits than its factorization.

99999199988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13306726 (or 13306724 counting only the distinct ones).

The product of its digits is 2754990144, while the sum is 89.

The spelling of 99999199988 in words is "ninety-nine billion, nine hundred ninety-nine million, one hundred ninety-nine thousand, nine hundred eighty-eight".