1166516605 has 4 divisors (see below), whose sum is σ = 1399819932. Its totient is φ = 933213280.

The previous prime is 1166516579. The next prime is 1166516621. The reversal of 1166516605 is 5066156611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 439782841 + 726733764 = 20971^2 + 26958^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1166516605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116651656 + ... + 116651665.

It is an arithmetic number, because the mean of its divisors is an integer number (349954983).

Almost surely, 2^1166516605 is an apocalyptic number.

It is an amenable number.

1166516605 is a deficient number, since it is larger than the sum of its proper divisors (233303327).

1166516605 is an equidigital number, since it uses as much as digits as its factorization.

1166516605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233303326.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1166516605 is about 34154.3058046859. The cubic root of 1166516605 is about 1052.6814622718.

It can be divided in two parts, 116651 and 6605, that added together give a triangular number (123256 = T₄₉₆).

The spelling of 1166516605 in words is "one billion, one hundred sixty-six million, five hundred sixteen thousand, six hundred five".