1171236881665 has 8 divisors (see below), whose sum is σ = 1405495226088. Its totient is φ = 936982193280.

The previous prime is 1171236881623. The next prime is 1171236881699. The reversal of 1171236881665 is 5661886321711.

It can be written as a sum of positive squares in 4 ways, for example, as 616463663104 + 554773218561 = 785152^2 + 744831^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1171236881665 - 2⁷ = 1171236881537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151372 + ... + 1537981.

It is an arithmetic number, because the mean of its divisors is an integer number (175686903261).

Almost surely, 2^{1171236881665} is an apocalyptic number.

It is an amenable number.

1171236881665 is a deficient number, since it is larger than the sum of its proper divisors (234258344423).

1171236881665 is a wasteful number, since it uses less digits than its factorization.

1171236881665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828019.

The product of its digits is 2903040, while the sum is 55.

The spelling of 1171236881665 in words is "one trillion, one hundred seventy-one billion, two hundred thirty-six million, eight hundred eighty-one thousand, six hundred sixty-five".