16668168791 has 4 divisors (see below), whose sum is σ = 16692936432. Its totient is φ = 16643401152.

The previous prime is 16668168787. The next prime is 16668168827. The reversal of 16668168791 is 19786186661.

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

It is a cyclic number.

It is not a de Polignac number, because 16668168791 - 2² = 16668168787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16668168791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16668168761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12382811 + ... + 12384156.

It is an arithmetic number, because the mean of its divisors is an integer number (4173234108).

Almost surely, 2^16668168791 is an apocalyptic number.

16668168791 is a deficient number, since it is larger than the sum of its proper divisors (24767641).

16668168791 is an equidigital number, since it uses as much as digits as its factorization.

16668168791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24767640.

The product of its digits is 5225472, while the sum is 59.

The spelling of 16668168791 in words is "sixteen billion, six hundred sixty-eight million, one hundred sixty-eight thousand, seven hundred ninety-one".