1166511113 has 4 divisors (see below), whose sum is σ = 1185634308. Its totient is φ = 1147387920.

The previous prime is 1166511103. The next prime is 1166511127. The reversal of 1166511113 is 3111156611.

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 687907984 + 478603129 = 26228^2 + 21877^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166511113 - 2⁸ = 1166510857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1166511103) 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, 9561506 + ... + 9561627.

It is an arithmetic number, because the mean of its divisors is an integer number (296408577).

Almost surely, 2^1166511113 is an apocalyptic number.

It is an amenable number.

1166511113 is a deficient number, since it is larger than the sum of its proper divisors (19123195).

1166511113 is an equidigital number, since it uses as much as digits as its factorization.

1166511113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19123194.

The product of its digits is 540, while the sum is 26.

The square root of 1166511113 is about 34154.2254047724. The cubic root of 1166511113 is about 1052.6798102491.

Adding to 1166511113 its reverse (3111156611), we get a palindrome (4277667724).

The spelling of 1166511113 in words is "one billion, one hundred sixty-six million, five hundred eleven thousand, one hundred thirteen".