11000000009999 has 64 divisors (see below), whose sum is σ = 14891495915520. Its totient is φ = 7846839792000.

The previous prime is 11000000009951. The next prime is 11000000010061. The reversal of 11000000009999 is 99990000000011.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-11000000009999 is a prime.

11000000009999 is a modest number, since divided by 9999 gives 11 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 (11000000009399) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63197312 + ... + 63371130.

It is an arithmetic number, because the mean of its divisors is an integer number (232679623680).

Almost surely, 2^{11000000009999} is an apocalyptic number.

11000000009999 is a deficient number, since it is larger than the sum of its proper divisors (3891495905521).

11000000009999 is a wasteful number, since it uses less digits than its factorization.

11000000009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174372.

The product of its (nonzero) digits is 6561, while the sum is 38.

It can be divided in two parts, 110000000099 and 99, that multiplied together give a palindrome (10890000009801).

The spelling of 11000000009999 in words is "eleven trillion, nine thousand, nine hundred ninety-nine".