1166131311165 has 48 divisors (see below), whose sum is σ = 2123144974080. Its totient is φ = 590956185600.

The previous prime is 1166131311067. The next prime is 1166131311239. The reversal of 1166131311165 is 5611131316611.

1166131311165 is a `hidden beast` number, since 1 + 1 + 6 + 613 + 1 + 31 + 1 + 1 + 6 + 5 = 666.

It is not a de Polignac number, because 1166131311165 - 2¹¹ = 1166131309117 is a prime.

It is a super-3 number, since 3×1166131311165³ (a number of 37 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3574500 + ... + 3887069.

It is an arithmetic number, because the mean of its divisors is an integer number (44232186960).

Almost surely, 2^{1166131311165} is an apocalyptic number.

1166131311165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166131311165 is a deficient number, since it is larger than the sum of its proper divisors (957013662915).

1166131311165 is a wasteful number, since it uses less digits than its factorization.

1166131311165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7461754 (or 7461751 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

Adding to 1166131311165 its reverse (5611131316611), we get a palindrome (6777262627776).

The spelling of 1166131311165 in words is "one trillion, one hundred sixty-six billion, one hundred thirty-one million, three hundred eleven thousand, one hundred sixty-five".