1668686703604 has 24 divisors (see below), whose sum is σ = 2932239045960. Its totient is φ = 830905614336.

The previous prime is 1668686703587. The next prime is 1668686703611. The reversal of 1668686703604 is 4063076868661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 550190095504 + 1118496608100 = 741748^2 + 1057590^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4335532 + ... + 4704700.

It is an arithmetic number, because the mean of its divisors is an integer number (122176626915).

Almost surely, 2^{1668686703604} is an apocalyptic number.

It is an amenable number.

1668686703604 is a deficient number, since it is larger than the sum of its proper divisors (1263552342356).

1668686703604 is a wasteful number, since it uses less digits than its factorization.

1668686703604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373827 (or 373825 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 61.

The spelling of 1668686703604 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, six hundred four".