668841845219 has 4 divisors (see below), whose sum is σ = 669061212600. Its totient is φ = 668622477840.

The previous prime is 668841845101. The next prime is 668841845237. The reversal of 668841845219 is 912548148866.

668841845219 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668841845219 is a prime.

It is a super-2 number, since 2×668841845219² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668841845249) 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, 109679117 + ... + 109685214.

It is an arithmetic number, because the mean of its divisors is an integer number (167265303150).

Almost surely, 2^668841845219 is an apocalyptic number.

668841845219 is a deficient number, since it is larger than the sum of its proper divisors (219367381).

668841845219 is a wasteful number, since it uses less digits than its factorization.

668841845219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219367380.

The product of its digits is 26542080, while the sum is 62.

The spelling of 668841845219 in words is "six hundred sixty-eight billion, eight hundred forty-one million, eight hundred forty-five thousand, two hundred nineteen".