1166515565 has 8 divisors (see below), whose sum is σ = 1400117400. Its totient is φ = 933013312.

The previous prime is 1166515543. The next prime is 1166515577. The reversal of 1166515565 is 5655156611.

It can be written as a sum of positive squares in 4 ways, for example, as 114875524 + 1051640041 = 10718^2 + 32429^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1166515565 - 2¹⁰ = 1166514541 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3911 + ... + 48459.

It is an arithmetic number, because the mean of its divisors is an integer number (175014675).

Almost surely, 2^1166515565 is an apocalyptic number.

It is an amenable number.

1166515565 is a deficient number, since it is larger than the sum of its proper divisors (233601835).

1166515565 is an equidigital number, since it uses as much as digits as its factorization.

1166515565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49791.

The product of its digits is 135000, while the sum is 41.

The square root of 1166515565 is about 34154.2905796622. The cubic root of 1166515565 is about 1052.6811494347.

The spelling of 1166515565 in words is "one billion, one hundred sixty-six million, five hundred fifteen thousand, five hundred sixty-five".