999009900998 has 16 divisors (see below), whose sum is σ = 1593652500144. Its totient is φ = 468051279360.

The previous prime is 999009900953. The next prime is 999009901003. The reversal of 999009900998 is 899009900999.

It is a super-2 number, since 2×999009900998² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 64711763 + ... + 64727198.

It is an arithmetic number, because the mean of its divisors is an integer number (99603281259).

Almost surely, 2^999009900998 is an apocalyptic number.

999009900998 is a deficient number, since it is larger than the sum of its proper divisors (594642599146).

999009900998 is a wasteful number, since it uses less digits than its factorization.

999009900998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129439207.

The product of its (nonzero) digits is 38263752, while the sum is 71.

Subtracting from 999009900998 its reverse (899009900999), we obtain a palindrome (99999999999).

The spelling of 999009900998 in words is "nine hundred ninety-nine billion, nine million, nine hundred thousand, nine hundred ninety-eight".