1668686701685 has 16 divisors (see below), whose sum is σ = 2004093487872. Its totient is φ = 1333836672000.

The previous prime is 1668686701679. The next prime is 1668686701723. The reversal of 1668686701685 is 5861076868661.

It is not a de Polignac number, because 1668686701685 - 2¹⁰ = 1668686700661 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 73431125 + ... + 73453845.

It is an arithmetic number, because the mean of its divisors is an integer number (125255842992).

Almost surely, 2^{1668686701685} is an apocalyptic number.

It is an amenable number.

1668686701685 is a deficient number, since it is larger than the sum of its proper divisors (335406786187).

1668686701685 is a wasteful number, since it uses less digits than its factorization.

1668686701685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34324.

The product of its (nonzero) digits is 139345920, while the sum is 68.

The spelling of 1668686701685 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred one thousand, six hundred eighty-five".