11665101605 has 4 divisors (see below), whose sum is σ = 13998121932. Its totient is φ = 9332081280.

The previous prime is 11665101601. The next prime is 11665101641. The reversal of 11665101605 is 50610156611.

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 9261945121 + 2403156484 = 96239^2 + 49022^2 .

It is not a de Polignac number, because 11665101605 - 2² = 11665101601 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 (11665101601) 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, 1166510156 + ... + 1166510165.

It is an arithmetic number, because the mean of its divisors is an integer number (3499530483).

Almost surely, 2^11665101605 is an apocalyptic number.

It is an amenable number.

11665101605 is a deficient number, since it is larger than the sum of its proper divisors (2333020327).

11665101605 is an equidigital number, since it uses as much as digits as its factorization.

11665101605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333020326.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 11665101605 in words is "eleven billion, six hundred sixty-five million, one hundred one thousand, six hundred five".