11663376565 has 4 divisors (see below), whose sum is σ = 13996051884. Its totient is φ = 9330701248.

The previous prime is 11663376563. The next prime is 11663376583. The reversal of 11663376565 is 56567336611.

It is a happy number.

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 7200201316 + 4463175249 = 84854^2 + 66807^2 .

It is a cyclic number.

It is not a de Polignac number, because 11663376565 - 2¹ = 11663376563 is a prime.

It is a super-3 number, since 3×11663376565³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11663376563) 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, 1166337652 + ... + 1166337661.

It is an arithmetic number, because the mean of its divisors is an integer number (3499012971).

Almost surely, 2^11663376565 is an apocalyptic number.

It is an amenable number.

11663376565 is a deficient number, since it is larger than the sum of its proper divisors (2332675319).

11663376565 is an equidigital number, since it uses as much as digits as its factorization.

11663376565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332675318.

The product of its digits is 2041200, while the sum is 49.

The spelling of 11663376565 in words is "eleven billion, six hundred sixty-three million, three hundred seventy-six thousand, five hundred sixty-five".