1166217165 has 24 divisors (see below), whose sum is σ = 2091150360. Its totient is φ = 600534144.

The previous prime is 1166217149. The next prime is 1166217181. The reversal of 1166217165 is 5617126611.

It is a happy number.

1166217165 is a `hidden beast` number, since 1 + 16 + 621 + 7 + 16 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1166217149) and next prime (1166217181).

It can be written as a sum of positive squares in 4 ways, for example, as 17413929 + 1148803236 = 4173^2 + 33894^2 .

It is not a de Polignac number, because 1166217165 - 2⁴ = 1166217149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 445522 + ... + 448131.

It is an arithmetic number, because the mean of its divisors is an integer number (87131265).

Almost surely, 2^1166217165 is an apocalyptic number.

1166217165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166217165 is a deficient number, since it is larger than the sum of its proper divisors (924933195).

1166217165 is a wasteful number, since it uses less digits than its factorization.

1166217165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893693 (or 893690 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 1166217165 is about 34149.9218886369. The cubic root of 1166217165 is about 1052.5913815674.

The spelling of 1166217165 in words is "one billion, one hundred sixty-six million, two hundred seventeen thousand, one hundred sixty-five".