1668397844707 has 8 divisors (see below), whose sum is σ = 1828088309952. Its totient is φ = 1510043701800.

The previous prime is 1668397844693. The next prime is 1668397844749. The reversal of 1668397844707 is 7074487938661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668397844707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668397845707) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 334077969 + ... + 334082962.

It is an arithmetic number, because the mean of its divisors is an integer number (228511038744).

Almost surely, 2^{1668397844707} is an apocalyptic number.

1668397844707 is a deficient number, since it is larger than the sum of its proper divisors (159690465245).

1668397844707 is a wasteful number, since it uses less digits than its factorization.

1668397844707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668161169.

The product of its (nonzero) digits is 341397504, while the sum is 70.

The spelling of 1668397844707 in words is "one trillion, six hundred sixty-eight billion, three hundred ninety-seven million, eight hundred forty-four thousand, seven hundred seven".