1161330331611 has 4 divisors (see below), whose sum is σ = 1548440442152. Its totient is φ = 774220221072.

The previous prime is 1161330331573. The next prime is 1161330331649.

1161330331611 is nontrivially palindromic in base 10.

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

It is an interprime number because it is at equal distance from previous prime (1161330331573) and next prime (1161330331649).

It is not a de Polignac number, because 1161330331611 - 2⁹ = 1161330331099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161330331661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193555055266 + ... + 193555055271.

It is an arithmetic number, because the mean of its divisors is an integer number (387110110538).

Almost surely, 2^{1161330331611} is an apocalyptic number.

1161330331611 is a deficient number, since it is larger than the sum of its proper divisors (387110110541).

1161330331611 is an equidigital number, since it uses as much as digits as its factorization.

1161330331611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387110110540.

The product of its (nonzero) digits is 2916, while the sum is 30.

It can be divided in two parts, 1161330 and 331611, that added together give a palindrome (1492941).

The spelling of 1161330331611 in words is "one trillion, one hundred sixty-one billion, three hundred thirty million, three hundred thirty-one thousand, six hundred eleven".