9900099999 has 12 divisors (see below), whose sum is σ = 14403025000. Its totient is φ = 6552583344.

The previous prime is 9900099997. The next prime is 9900100003. The reversal of 9900099999 is 9999900099.

It is not a de Polignac number, because 9900099999 - 2¹ = 9900099997 is a prime.

It is a Duffinian number.

9900099999 is a modest number, since divided by 99999 gives 99000 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900099997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3955624 + ... + 3958125.

Almost surely, 2^9900099999 is an apocalyptic number.

9900099999 is a deficient number, since it is larger than the sum of its proper divisors (4502925001).

9900099999 is a wasteful number, since it uses less digits than its factorization.

9900099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7913894 (or 7913891 counting only the distinct ones).

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

The square root of 9900099999 is about 99499.2462232755. The cubic root of 9900099999 is about 2147.2363986501.

Subtracting 9900099999 from its reverse (9999900099), we obtain a square (99800100 = 9990²).

The spelling of 9900099999 in words is "nine billion, nine hundred million, ninety-nine thousand, nine hundred ninety-nine".