1668086785 has 8 divisors (see below), whose sum is σ = 2034519336. Its totient is φ = 1312592640.

The previous prime is 1668086759. The next prime is 1668086803. The reversal of 1668086785 is 5876808661.

It can be written as a sum of positive squares in 4 ways, for example, as 206324496 + 1461762289 = 14364^2 + 38233^2 .

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

It is not a de Polignac number, because 1668086785 - 2²³ = 1659698177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2734264 + ... + 2734873.

It is an arithmetic number, because the mean of its divisors is an integer number (254314917).

Almost surely, 2^1668086785 is an apocalyptic number.

It is an amenable number.

1668086785 is a deficient number, since it is larger than the sum of its proper divisors (366432551).

1668086785 is an equidigital number, since it uses as much as digits as its factorization.

1668086785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5469203.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The square root of 1668086785 is about 40842.2181694383. The cubic root of 1668086785 is about 1185.9677531905.

The spelling of 1668086785 in words is "one billion, six hundred sixty-eight million, eighty-six thousand, seven hundred eighty-five".