1668366685 has 8 divisors (see below), whose sum is σ = 2008438200. Its totient is φ = 1330427904.

The previous prime is 1668366647. The next prime is 1668366697. The reversal of 1668366685 is 5866638661.

It can be written as a sum of positive squares in 4 ways, for example, as 20169081 + 1648197604 = 4491^2 + 40598^2 .

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 1668366685 - 2⁹ = 1668366173 is a prime.

It is a congruent number.

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, 531460 + ... + 534589.

It is an arithmetic number, because the mean of its divisors is an integer number (251054775).

Almost surely, 2^1668366685 is an apocalyptic number.

It is an amenable number.

1668366685 is a deficient number, since it is larger than the sum of its proper divisors (340071515).

1668366685 is a wasteful number, since it uses less digits than its factorization.

1668366685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066367.

The product of its digits is 7464960, while the sum is 55.

The square root of 1668366685 is about 40845.6446270591. The cubic root of 1668366685 is about 1186.0340834342.

The spelling of 1668366685 in words is "one billion, six hundred sixty-eight million, three hundred sixty-six thousand, six hundred eighty-five".