1668686703616 has 22 divisors (see below), whose sum is σ = 3335743832420. Its totient is φ = 834343351296.

The previous prime is 1668686703611. The next prime is 1668686703617. The reversal of 1668686703616 is 6163076868661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is not an unprimeable number, because it can be changed into a prime (1668686703611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814787406 + ... + 814789453.

Almost surely, 2^{1668686703616} is an apocalyptic number.

1668686703616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1668686703616 is a deficient number, since it is larger than the sum of its proper divisors (1667057128804).

1668686703616 is an equidigital number, since it uses as much as digits as its factorization.

1668686703616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629576879 (or 1629576861 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 64.

The spelling of 1668686703616 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, six hundred sixteen".