999099090918 has 20 divisors (see below), whose sum is σ = 2238722037420. Its totient is φ = 333033030252.

The previous prime is 999099090911. The next prime is 999099090919. The reversal of 999099090918 is 819090990999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999099090911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3083639008 + ... + 3083639331.

It is an arithmetic number, because the mean of its divisors is an integer number (111936101871).

Almost surely, 2^999099090918 is an apocalyptic number.

999099090918 is an abundant number, since it is smaller than the sum of its proper divisors (1239622946502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999099090918 is a wasteful number, since it uses less digits than its factorization.

999099090918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167278353 (or 6167278344 counting only the distinct ones).

The product of its (nonzero) digits is 38263752, while the sum is 72.

The spelling of 999099090918 in words is "nine hundred ninety-nine billion, ninety-nine million, ninety thousand, nine hundred eighteen".