11015640665 has 8 divisors (see below), whose sum is σ = 13228783368. Its totient is φ = 8805836160.

The previous prime is 11015640641. The next prime is 11015640679. The reversal of 11015640665 is 56604651011.

It can be written as a sum of positive squares in 4 ways, for example, as 2379098176 + 8636542489 = 48776^2 + 92933^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11015640665 - 2²⁰ = 11014592089 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827282 + ... + 840491.

It is an arithmetic number, because the mean of its divisors is an integer number (1653597921).

Almost surely, 2^11015640665 is an apocalyptic number.

It is an amenable number.

11015640665 is a deficient number, since it is larger than the sum of its proper divisors (2213142703).

11015640665 is a wasteful number, since it uses less digits than its factorization.

11015640665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669099.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 11015640665 in words is "eleven billion, fifteen million, six hundred forty thousand, six hundred sixty-five".