1668516851686 has 8 divisors (see below), whose sum is σ = 2502782289504. Its totient is φ = 834256088520.

The previous prime is 1668516851669. The next prime is 1668516851707. The reversal of 1668516851686 is 6861586158661.

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

It is a super-3 number, since 3×1668516851686³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69630 + ... + 1828081.

It is an arithmetic number, because the mean of its divisors is an integer number (312847786188).

Almost surely, 2^{1668516851686} is an apocalyptic number.

1668516851686 is a deficient number, since it is larger than the sum of its proper divisors (834265437818).

1668516851686 is a wasteful number, since it uses less digits than its factorization.

1668516851686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337326.

The product of its digits is 99532800, while the sum is 67.

The spelling of 1668516851686 in words is "one trillion, six hundred sixty-eight billion, five hundred sixteen million, eight hundred fifty-one thousand, six hundred eighty-six".