11168031661 has 4 divisors (see below), whose sum is σ = 11168348832. Its totient is φ = 11167714492.

The previous prime is 11168031649. The next prime is 11168031673. The reversal of 11168031661 is 16613086111.

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 an interprime number because it is at equal distance from previous prime (11168031649) and next prime (11168031673).

It is a cyclic number.

It is not a de Polignac number, because 11168031661 - 2¹⁵ = 11167998893 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 (11168031601) 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, 98071 + ... + 178756.

It is an arithmetic number, because the mean of its divisors is an integer number (2792087208).

Almost surely, 2^11168031661 is an apocalyptic number.

It is an amenable number.

11168031661 is a deficient number, since it is larger than the sum of its proper divisors (317171).

11168031661 is an equidigital number, since it uses as much as digits as its factorization.

11168031661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317170.

The product of its (nonzero) digits is 5184, while the sum is 34.

It can be divided in two parts, 111680 and 31661, that added together give a palindrome (143341).

The spelling of 11168031661 in words is "eleven billion, one hundred sixty-eight million, thirty-one thousand, six hundred sixty-one".