1331665585 has 8 divisors (see below), whose sum is σ = 1598403456. Its totient is φ = 1065062640.

The previous prime is 1331665583. The next prime is 1331665627. The reversal of 1331665585 is 5855661331.

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

It is not a de Polignac number, because 1331665585 - 2¹ = 1331665583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331665583) 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 7 ways as a sum of consecutive naturals, for example, 10569 + ... + 52678.

It is an arithmetic number, because the mean of its divisors is an integer number (199800432).

Almost surely, 2^1331665585 is an apocalyptic number.

It is an amenable number.

1331665585 is a deficient number, since it is larger than the sum of its proper divisors (266737871).

1331665585 is an equidigital number, since it uses as much as digits as its factorization.

1331665585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67463.

The product of its digits is 324000, while the sum is 43.

The square root of 1331665585 is about 36491.9934369171. The cubic root of 1331665585 is about 1100.1833261944.

The spelling of 1331665585 in words is "one billion, three hundred thirty-one million, six hundred sixty-five thousand, five hundred eighty-five".