11111011111205 has 8 divisors (see below), whose sum is σ = 13658413658904. Its totient is φ = 8672008672000.

The previous prime is 11111011111199. The next prime is 11111011111217. The reversal of 11111011111205 is 50211111011111.

It can be written as a sum of positive squares in 4 ways, for example, as 993357068929 + 10117654042276 = 996673^2 + 3180826^2 .

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

It is not a de Polignac number, because 11111011111205 - 2¹⁶ = 11111011045669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27100026896 + ... + 27100027305.

It is an arithmetic number, because the mean of its divisors is an integer number (1707301707363).

Almost surely, 2^{11111011111205} is an apocalyptic number.

It is an amenable number.

11111011111205 is a deficient number, since it is larger than the sum of its proper divisors (2547402547699).

11111011111205 is an equidigital number, since it uses as much as digits as its factorization.

11111011111205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54200054247.

The product of its (nonzero) digits is 10, while the sum is 17.

Adding to 11111011111205 its reverse (50211111011111), we get a palindrome (61322122122316).

The spelling of 11111011111205 in words is "eleven trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, two hundred five".