1666839965 has 8 divisors (see below), whose sum is σ = 2285952000. Its totient is φ = 1142975952.

The previous prime is 1666839959. The next prime is 1666840027. The reversal of 1666839965 is 5699386661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666839965 - 2⁸ = 1666839709 is a prime.

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, 23811965 + ... + 23812034.

It is an arithmetic number, because the mean of its divisors is an integer number (285744000).

Almost surely, 2^1666839965 is an apocalyptic number.

It is an amenable number.

1666839965 is a deficient number, since it is larger than the sum of its proper divisors (619112035).

1666839965 is an equidigital number, since it uses as much as digits as its factorization.

1666839965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47624011.

The product of its digits is 12597120, while the sum is 59.

The square root of 1666839965 is about 40826.9514536660. The cubic root of 1666839965 is about 1185.6721936512.

The spelling of 1666839965 in words is "one billion, six hundred sixty-six million, eight hundred thirty-nine thousand, nine hundred sixty-five".