1331666005 has 8 divisors (see below), whose sum is σ = 1599025824. Its totient is φ = 1064648400.

The previous prime is 1331665987. The next prime is 1331666033. The reversal of 1331666005 is 5006661331.

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

It is not a de Polignac number, because 1331666005 - 2¹⁹ = 1331141717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 76911 + ... + 92620.

It is an arithmetic number, because the mean of its divisors is an integer number (199878228).

Almost surely, 2^1331666005 is an apocalyptic number.

It is an amenable number.

1331666005 is a deficient number, since it is larger than the sum of its proper divisors (267359819).

1331666005 is a wasteful number, since it uses less digits than its factorization.

1331666005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171107.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 1331666005 is about 36491.9991916036. Note that the first 3 decimals coincide. The cubic root of 1331666005 is about 1100.1834418583.

The spelling of 1331666005 in words is "one billion, three hundred thirty-one million, six hundred sixty-six thousand, five".