11505345311 has 4 divisors (see below), whose sum is σ = 11722427352. Its totient is φ = 11288263272.

The previous prime is 11505345287. The next prime is 11505345317. The reversal of 11505345311 is 11354350511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11505345311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11505345317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108540941 + ... + 108541046.

It is an arithmetic number, because the mean of its divisors is an integer number (2930606838).

Almost surely, 2^11505345311 is an apocalyptic number.

11505345311 is a deficient number, since it is larger than the sum of its proper divisors (217082041).

11505345311 is an equidigital number, since it uses as much as digits as its factorization.

11505345311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217082040.

The product of its (nonzero) digits is 4500, while the sum is 29.

Adding to 11505345311 its reverse (11354350511), we get a palindrome (22859695822).

The spelling of 11505345311 in words is "eleven billion, five hundred five million, three hundred forty-five thousand, three hundred eleven".