1165541334681 has 4 divisors (see below), whose sum is σ = 1554055112912. Its totient is φ = 777027556452.

The previous prime is 1165541334673. The next prime is 1165541334691. The reversal of 1165541334681 is 1864331455611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1165541334681 - 2³ = 1165541334673 is a prime.

It is a super-2 number, since 2×1165541334681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1165541334681.

It is not an unprimeable number, because it can be changed into a prime (1165541334691) 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, 194256889111 + ... + 194256889116.

It is an arithmetic number, because the mean of its divisors is an integer number (388513778228).

Almost surely, 2^{1165541334681} is an apocalyptic number.

It is an amenable number.

1165541334681 is a deficient number, since it is larger than the sum of its proper divisors (388513778231).

1165541334681 is an equidigital number, since it uses as much as digits as its factorization.

1165541334681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388513778230.

The product of its digits is 1036800, while the sum is 48.

The spelling of 1165541334681 in words is "one trillion, one hundred sixty-five billion, five hundred forty-one million, three hundred thirty-four thousand, six hundred eighty-one".