11185311165 has 32 divisors (see below), whose sum is σ = 21158426880. Its totient is φ = 4936963584.

The previous prime is 11185311161. The next prime is 11185311167. The reversal of 11185311165 is 56111358111.

It is not a de Polignac number, because 11185311165 - 2² = 11185311161 is a prime.

It is a super-2 number, since 2×11185311165² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11185311161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1833624 + ... + 1839713.

It is an arithmetic number, because the mean of its divisors is an integer number (661200840).

Almost surely, 2^11185311165 is an apocalyptic number.

11185311165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11185311165 is a deficient number, since it is larger than the sum of its proper divisors (9973115715).

11185311165 is a wasteful number, since it uses less digits than its factorization.

11185311165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673381.

The product of its digits is 3600, while the sum is 33.

Adding to 11185311165 its reverse (56111358111), we get a palindrome (67296669276).

The spelling of 11185311165 in words is "eleven billion, one hundred eighty-five million, three hundred eleven thousand, one hundred sixty-five".