99990909998 has 8 divisors (see below), whose sum is σ = 171412988592. Its totient is φ = 42853247136.

The previous prime is 99990909983. The next prime is 99990910039. The reversal of 99990909998 is 89990909999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571103915 + ... + 3571103942.

It is an arithmetic number, because the mean of its divisors is an integer number (21426623574).

Almost surely, 2^99990909998 is an apocalyptic number.

99990909998 is a deficient number, since it is larger than the sum of its proper divisors (71422078594).

99990909998 is a wasteful number, since it uses less digits than its factorization.

99990909998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142207866.

The product of its (nonzero) digits is 344373768, while the sum is 80.

Subtracting from 99990909998 its reverse (89990909999), we obtain a palindrome (9999999999).

The spelling of 99990909998 in words is "ninety-nine billion, nine hundred ninety million, nine hundred nine thousand, nine hundred ninety-eight".