990999999098 has 32 divisors (see below), whose sum is σ = 1628317728000. Its totient is φ = 450243399424.

The previous prime is 990999999097. The next prime is 990999999103. The reversal of 990999999098 is 890999999099.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (990999999097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31148603 + ... + 31180401.

It is an arithmetic number, because the mean of its divisors is an integer number (50884929000).

Almost surely, 2^990999999098 is an apocalyptic number.

990999999098 is a deficient number, since it is larger than the sum of its proper divisors (637317728902).

990999999098 is a wasteful number, since it uses less digits than its factorization.

990999999098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63454.

The product of its (nonzero) digits is 3099363912, while the sum is 89.

Subtracting from 990999999098 its reverse (890999999099), we obtain a palindrome (99999999999).

The spelling of 990999999098 in words is "nine hundred ninety billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, ninety-eight".