1666685037018 has 16 divisors (see below), whose sum is σ = 3333402210240. Its totient is φ = 555556322976.

The previous prime is 1666685036953. The next prime is 1666685037019. The reversal of 1666685037018 is 8107305866661.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666685037019) by changing a digit.

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, 636430 + ... + 1933497.

It is an arithmetic number, because the mean of its divisors is an integer number (208337638140).

Almost surely, 2^{1666685037018} is an apocalyptic number.

1666685037018 is an abundant number, since it is smaller than the sum of its proper divisors (1666717173222).

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

1666685037018 is a wasteful number, since it uses less digits than its factorization.

1666685037018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678021.

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 1666685037018 in words is "one trillion, six hundred sixty-six billion, six hundred eighty-five million, thirty-seven thousand, eighteen".