99999199999 has 2 divisors, whose sum is σ = 99999200000.
Its totient is φ = 99999199998.
The previous prime is 99999199987. The next prime is 99999200003.
99999199999 is nontrivially palindromic in base 10.
It is a strong prime.
It is a palprime.
It is a cyclic number.
It is not a de Polignac number, because 99999199999 - 213 = 99999191807 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99999199919) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999599999 + 49999600000.
It is an arithmetic number, because the mean of its divisors is an integer number (49999600000).
Almost surely, 299999199999 is an apocalyptic number.
99999199999 is a deficient number, since it is larger than the sum of its proper divisors (1).
99999199999 is an equidigital number, since it uses as much as digits as its factorization.
99999199999 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3486784401, while the sum is 91.
The spelling of 99999199999 in words is "ninety-nine billion, nine hundred ninety-nine million, one hundred ninety-nine thousand, nine hundred ninety-nine".