11515511065 has 4 divisors (see below), whose sum is σ = 13818613284. Its totient is φ = 9212408848.

The previous prime is 11515511011. The next prime is 11515511123. The reversal of 11515511065 is 56011551511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3761123584 + 7754387481 = 61328^2 + 88059^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515511065 - 2¹¹ = 11515509017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151551102 + ... + 1151551111.

It is an arithmetic number, because the mean of its divisors is an integer number (3454653321).

Almost surely, 2^11515511065 is an apocalyptic number.

It is an amenable number.

11515511065 is a deficient number, since it is larger than the sum of its proper divisors (2303102219).

11515511065 is an equidigital number, since it uses as much as digits as its factorization.

11515511065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303102218.

The product of its (nonzero) digits is 3750, while the sum is 31.

The spelling of 11515511065 in words is "eleven billion, five hundred fifteen million, five hundred eleven thousand, sixty-five".