9999999911 has 8 divisors (see below), whose sum is σ = 10916720784. Its totient is φ = 9084550720.

The previous prime is 9999999881. The next prime is 9999999929. The reversal of 9999999911 is 1199999999.

9999999911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 9999999911 - 2¹⁴ = 9999983527 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

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 (9999999511) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 301436 + ... + 332961.

It is an arithmetic number, because the mean of its divisors is an integer number (1364590098).

Almost surely, 2^9999999911 is an apocalyptic number.

9999999911 is a deficient number, since it is larger than the sum of its proper divisors (916720873).

9999999911 is a wasteful number, since it uses less digits than its factorization.

9999999911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635841.

The product of its digits is 43046721, while the sum is 74.

The square root of 9999999911 is about 99999.9995550000. Note that the first 3 decimals coincide. The cubic root of 9999999911 is about 2154.4346836404.

The spelling of 9999999911 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eleven".