999997999899 has 16 divisors (see below), whose sum is σ = 1336607180832. Its totient is φ = 665027532288.

The previous prime is 999997999837. The next prime is 999997999919. The reversal of 999997999899 is 998999799999.

It is a happy number.

It is not a de Polignac number, because 999997999899 - 2¹² = 999997995803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999997999797 and 999997999806.

It is not an unprimeable number, because it can be changed into a prime (999997999199) 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 15 ways as a sum of consecutive naturals, for example, 9347677 + ... + 9454049.

It is an arithmetic number, because the mean of its divisors is an integer number (83537948802).

Almost surely, 2^999997999899 is an apocalyptic number.

999997999899 is a deficient number, since it is larger than the sum of its proper divisors (336609180933).

999997999899 is a wasteful number, since it uses less digits than its factorization.

999997999899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114046.

The product of its digits is 195259926456, while the sum is 105.

The spelling of 999997999899 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, eight hundred ninety-nine".