1668686703666 has 32 divisors (see below), whose sum is σ = 3370748940288. Its totient is φ = 550673057040.

The previous prime is 1668686703637. The next prime is 1668686703667. The reversal of 1668686703666 is 6663076868661.

It is a self number, because there is not a number n which added to its sum of digits gives 1668686703666.

It is not an unprimeable number, because it can be changed into a prime (1668686703667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148351 + ... + 1832861.

It is an arithmetic number, because the mean of its divisors is an integer number (105335904384).

Almost surely, 2^{1668686703666} is an apocalyptic number.

1668686703666 is an abundant number, since it is smaller than the sum of its proper divisors (1702062236622).

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

1668686703666 is a wasteful number, since it uses less digits than its factorization.

1668686703666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686166.

The product of its (nonzero) digits is 376233984, while the sum is 69.

The spelling of 1668686703666 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, six hundred sixty-six".