11550111005 has 4 divisors (see below), whose sum is σ = 13860133212. Its totient is φ = 9240088800.

The previous prime is 11550110993. The next prime is 11550111007. The reversal of 11550111005 is 50011105511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50011105511 = 23627 ⋅2116693.

It can be written as a sum of positive squares in 2 ways, for example, as 9032981764 + 2517129241 = 95042^2 + 50171^2 .

It is not a de Polignac number, because 11550111005 - 2²⁸ = 11281675549 is a prime.

It is a super-2 number, since 2×11550111005² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11550111007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155011096 + ... + 1155011105.

It is an arithmetic number, because the mean of its divisors is an integer number (3465033303).

Almost surely, 2^11550111005 is an apocalyptic number.

It is an amenable number.

11550111005 is a deficient number, since it is larger than the sum of its proper divisors (2310022207).

11550111005 is an equidigital number, since it uses as much as digits as its factorization.

11550111005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310022206.

The product of its (nonzero) digits is 125, while the sum is 20.

Adding to 11550111005 its reverse (50011105511), we get a palindrome (61561216516).

The spelling of 11550111005 in words is "eleven billion, five hundred fifty million, one hundred eleven thousand, five".