1668055686 has 32 divisors (see below), whose sum is σ = 3644286336. Its totient is φ = 504792000.

The previous prime is 1668055681. The next prime is 1668055717. The reversal of 1668055686 is 6865508661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668055681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33621 + ... + 66831.

It is an arithmetic number, because the mean of its divisors is an integer number (113883948).

Almost surely, 2^1668055686 is an apocalyptic number.

1668055686 is an abundant number, since it is smaller than the sum of its proper divisors (1976230650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668055686 is a wasteful number, since it uses less digits than its factorization.

1668055686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33988.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 1668055686 is about 40841.8374464225. The cubic root of 1668055686 is about 1185.9603829424.

The spelling of 1668055686 in words is "one billion, six hundred sixty-eight million, fifty-five thousand, six hundred eighty-six".