1166605513 has 4 divisors (see below), whose sum is σ = 1195059348. Its totient is φ = 1138151680.

The previous prime is 1166605499. The next prime is 1166605519. The reversal of 1166605513 is 3155066611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3155066611 = 2887 ⋅1092853.

It can be written as a sum of positive squares in 2 ways, for example, as 37847104 + 1128758409 = 6152^2 + 33597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166605513 - 2²⁵ = 1133051081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166605519) 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, 14226856 + ... + 14226937.

It is an arithmetic number, because the mean of its divisors is an integer number (298764837).

Almost surely, 2^1166605513 is an apocalyptic number.

It is an amenable number.

1166605513 is a deficient number, since it is larger than the sum of its proper divisors (28453835).

1166605513 is an equidigital number, since it uses as much as digits as its factorization.

1166605513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28453834.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 1166605513 is about 34155.6073434509. The cubic root of 1166605513 is about 1052.7082055476.

The spelling of 1166605513 in words is "one billion, one hundred sixty-six million, six hundred five thousand, five hundred thirteen".