1668518686852 has 6 divisors (see below), whose sum is σ = 2919907701998. Its totient is φ = 834259343424.

The previous prime is 1668518686843. The next prime is 1668518686903. The reversal of 1668518686852 is 2586868158661.

It can be written as a sum of positive squares in only one way, i.e., 1185515926596 + 483002760256 = 1088814^2 + 694984^2 .

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 as a sum of consecutive naturals, namely, 208564835853 + ... + 208564835860.

Almost surely, 2^{1668518686852} is an apocalyptic number.

It is an amenable number.

1668518686852 is a deficient number, since it is larger than the sum of its proper divisors (1251389015146).

1668518686852 is a wasteful number, since it uses less digits than its factorization.

1668518686852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417129671717 (or 417129671715 counting only the distinct ones).

The product of its digits is 265420800, while the sum is 70.

The spelling of 1668518686852 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, six hundred eighty-six thousand, eight hundred fifty-two".