99999990000 has 300 divisors, whose sum is σ = 351253188000. Its totient is φ = 26549376000.

The previous prime is 99999989983. The next prime is 99999990017. The reversal of 99999990000 is 9999999.

It is an interprime number because it is at equal distance from previous prime (99999989983) and next prime (99999990017).

It is a tau number, because it is divible by the number of its divisors (300).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99999990000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 21507676 + ... + 21512324.

It is an arithmetic number, because the mean of its divisors is an integer number (1170843960).

Almost surely, 2^99999990000 is an apocalyptic number.

99999990000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99999990000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175626594000).

99999990000 is an abundant number, since it is smaller than the sum of its proper divisors (251253198000).

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

99999990000 is a wasteful number, since it uses less digits than its factorization.

99999990000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922 (or 4898 counting only the distinct ones).

The product of its (nonzero) digits is 4782969, while the sum is 63.

99999990000 divided by its reverse (9999999) gives a 4-th power (10000 = 10⁴).

It can be divided in two parts, 9999 and 9990000, that added together give a palindrome (9999999).

The spelling of 99999990000 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety thousand".