1668686703682 has 4 divisors (see below), whose sum is σ = 2503030055526. Its totient is φ = 834343351840.

The previous prime is 1668686703679. The next prime is 1668686703701. The reversal of 1668686703682 is 2863076868661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 918053338801 + 750633364881 = 958151^2 + 866391^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417171675919 + ... + 417171675922.

Almost surely, 2^{1668686703682} is an apocalyptic number.

1668686703682 is a deficient number, since it is larger than the sum of its proper divisors (834343351844).

1668686703682 is an equidigital number, since it uses as much as digits as its factorization.

1668686703682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834343351843.

The product of its (nonzero) digits is 167215104, while the sum is 67.

The spelling of 1668686703682 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, six hundred eighty-two".