1668686703678 has 96 divisors (see below), whose sum is σ = 3653713720800. Its totient is φ = 550381547520.

The previous prime is 1668686703667. The next prime is 1668686703679. The reversal of 1668686703678 is 8763076868661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668686703679) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1286573526 + ... + 1286574822.

It is an arithmetic number, because the mean of its divisors is an integer number (38059517925).

Almost surely, 2^{1668686703678} is an apocalyptic number.

1668686703678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1668686703678 is an abundant number, since it is smaller than the sum of its proper divisors (1985027017122).

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

1668686703678 is a wasteful number, since it uses less digits than its factorization.

1668686703678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922 (or 2919 counting only the distinct ones).

The product of its (nonzero) digits is 585252864, while the sum is 72.

The spelling of 1668686703678 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, six hundred seventy-eight".