9900816399 has 6 divisors (see below), whose sum is σ = 14301179256. Its totient is φ = 6600544260.

The previous prime is 9900816397. The next prime is 9900816433. The reversal of 9900816399 is 9936180099.

It is not a de Polignac number, because 9900816399 - 2¹ = 9900816397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900816397) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 550045347 + ... + 550045364.

It is an arithmetic number, because the mean of its divisors is an integer number (2383529876).

Almost surely, 2^9900816399 is an apocalyptic number.

9900816399 is a deficient number, since it is larger than the sum of its proper divisors (4400362857).

9900816399 is a wasteful number, since it uses less digits than its factorization.

9900816399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100090717 (or 1100090714 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 9900816399 is about 99502.8461854233. The cubic root of 9900816399 is about 2147.2881908224.

The spelling of 9900816399 in words is "nine billion, nine hundred million, eight hundred sixteen thousand, three hundred ninety-nine".