99909990000 has 800 divisors, whose sum is σ = 375808952640. Its totient is φ = 25380864000.

The previous prime is 99909989987. The next prime is 99909990067. The reversal of 99909990000 is 9990999.

It is a super-2 number, since 2×99909990000² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 729269932 + ... + 729270068.

Almost surely, 2^99909990000 is an apocalyptic number.

99909990000 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 99909990000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187904476320).

99909990000 is an abundant number, since it is smaller than the sum of its proper divisors (275898962640).

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

99909990000 is a wasteful number, since it uses less digits than its factorization.

99909990000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

99909990000 divided by its reverse (9990999) gives a 4-th power (10000 = 10⁴).

The spelling of 99909990000 in words is "ninety-nine billion, nine hundred nine million, nine hundred ninety thousand".