1166689665 has 12 divisors (see below), whose sum is σ = 2022262164. Its totient is φ = 622234464.

The previous prime is 1166689649. The next prime is 1166689669. The reversal of 1166689665 is 5669866611.

It can be written as a sum of positive squares in 2 ways, for example, as 382241601 + 784448064 = 19551^2 + 28008^2 .

It is not a de Polignac number, because 1166689665 - 2⁴ = 1166689649 is a prime.

It is a super-2 number, since 2×1166689665² = 2722329548835624450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1166689669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12963174 + ... + 12963263.

It is an arithmetic number, because the mean of its divisors is an integer number (168521847).

Almost surely, 2^1166689665 is an apocalyptic number.

1166689665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166689665 is a deficient number, since it is larger than the sum of its proper divisors (855572499).

1166689665 is a wasteful number, since it uses less digits than its factorization.

1166689665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25926448 (or 25926445 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 1166689665 is about 34156.8392126672. The cubic root of 1166689665 is about 1052.7335169803.

The spelling of 1166689665 in words is "one billion, one hundred sixty-six million, six hundred eighty-nine thousand, six hundred sixty-five".