11165040661 has 4 divisors (see below), whose sum is σ = 11752674400. Its totient is φ = 10577406924.

The previous prime is 11165040637. The next prime is 11165040671. The reversal of 11165040661 is 16604056111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11165040661 - 2¹³ = 11165032469 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 (11165040671) 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, 293816841 + ... + 293816878.

It is an arithmetic number, because the mean of its divisors is an integer number (2938168600).

Almost surely, 2^11165040661 is an apocalyptic number.

It is an amenable number.

11165040661 is a deficient number, since it is larger than the sum of its proper divisors (587633739).

11165040661 is an equidigital number, since it uses as much as digits as its factorization.

11165040661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587633738.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 11165040661 its reverse (16604056111), we get a palindrome (27769096772).

The spelling of 11165040661 in words is "eleven billion, one hundred sixty-five million, forty thousand, six hundred sixty-one".