999998899999 has 6 divisors (see below), whose sum is σ = 1099172344760. Its totient is φ = 909089908980.

The previous prime is 999998899973. The next prime is 999998900059.

999998899999 is nontrivially palindromic in base 10.

999998899999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999998899999 - 2⁵ = 999998899967 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998899909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4132226739 + ... + 4132226980.

Almost surely, 2^999998899999 is an apocalyptic number.

999998899999 is a deficient number, since it is larger than the sum of its proper divisors (99173444761).

999998899999 is a wasteful number, since it uses less digits than its factorization.

999998899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8264453741 (or 8264453730 counting only the distinct ones).

The product of its digits is 223154201664, while the sum is 106.

It can be divided in two parts, 99999 and 8899999, that added together give a palindrome (8999998).

The spelling of 999998899999 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, eight hundred ninety-nine thousand, nine hundred ninety-nine".