1668666683518 has 4 divisors (see below), whose sum is σ = 2503000025280. Its totient is φ = 834333341758.

The previous prime is 1668666683483. The next prime is 1668666683521. The reversal of 1668666683518 is 8153866668661.

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

It is a super-2 number, since 2×1668666683518² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 417166670878 + ... + 417166670881.

It is an arithmetic number, because the mean of its divisors is an integer number (625750006320).

Almost surely, 2^{1668666683518} is an apocalyptic number.

1668666683518 is a deficient number, since it is larger than the sum of its proper divisors (834333341762).

1668666683518 is an equidigital number, since it uses as much as digits as its factorization.

1668666683518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834333341761.

The product of its digits is 358318080, while the sum is 70.

The spelling of 1668666683518 in words is "one trillion, six hundred sixty-eight billion, six hundred sixty-six million, six hundred eighty-three thousand, five hundred eighteen".