11511202005 has 20 divisors (see below), whose sum is σ = 20634896172. Its totient is φ = 6139307520.

The previous prime is 11511201967. The next prime is 11511202013. The reversal of 11511202005 is 50020211511.

It can be written as a sum of positive squares in 2 ways, for example, as 4197873681 + 7313328324 = 64791^2 + 85518^2 .

It is not a de Polignac number, because 11511202005 - 2⁶ = 11511201941 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14210956 + ... + 14211765.

Almost surely, 2^11511202005 is an apocalyptic number.

11511202005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11511202005 is a deficient number, since it is larger than the sum of its proper divisors (9123694167).

11511202005 is an equidigital number, since it uses as much as digits as its factorization.

11511202005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28422738 (or 28422729 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

Adding to 11511202005 its reverse (50020211511), we get a palindrome (61531413516).

The spelling of 11511202005 in words is "eleven billion, five hundred eleven million, two hundred two thousand, five".