1191082380665 has 4 divisors (see below), whose sum is σ = 1429298856804. Its totient is φ = 952865904528.

The previous prime is 1191082380661. The next prime is 1191082380673. The reversal of 1191082380665 is 5660832801911.

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 365266723129 + 825815657536 = 604373^2 + 908744^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191082380665 - 2² = 1191082380661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191082380661) 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 3 ways as a sum of consecutive naturals, for example, 119108238062 + ... + 119108238071.

It is an arithmetic number, because the mean of its divisors is an integer number (357324714201).

Almost surely, 2^{1191082380665} is an apocalyptic number.

It is an amenable number.

1191082380665 is a deficient number, since it is larger than the sum of its proper divisors (238216476139).

1191082380665 is an equidigital number, since it uses as much as digits as its factorization.

1191082380665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238216476138.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 1191082380665 in words is "one trillion, one hundred ninety-one billion, eighty-two million, three hundred eighty thousand, six hundred sixty-five".