11516550665 has 4 divisors (see below), whose sum is σ = 13819860804. Its totient is φ = 9213240528.

The previous prime is 11516550653. The next prime is 11516550667. The reversal of 11516550665 is 56605561511.

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 1546927561 + 9969623104 = 39331^2 + 99848^2 .

It is a cyclic number.

It is not a de Polignac number, because 11516550665 - 2¹⁰ = 11516549641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11516550667) 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, 1151655062 + ... + 1151655071.

It is an arithmetic number, because the mean of its divisors is an integer number (3454965201).

Almost surely, 2^11516550665 is an apocalyptic number.

It is an amenable number.

11516550665 is a deficient number, since it is larger than the sum of its proper divisors (2303310139).

11516550665 is an equidigital number, since it uses as much as digits as its factorization.

11516550665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303310138.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 11516550665 in words is "eleven billion, five hundred sixteen million, five hundred fifty thousand, six hundred sixty-five".