668448843 has 4 divisors (see below), whose sum is σ = 891265128. Its totient is φ = 445632560.

The previous prime is 668448817. The next prime is 668448863. The reversal of 668448843 is 348844866.

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 668448843 - 2⁶ = 668448779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668448863) 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, 111408138 + ... + 111408143.

It is an arithmetic number, because the mean of its divisors is an integer number (222816282).

Almost surely, 2^668448843 is an apocalyptic number.

668448843 is a deficient number, since it is larger than the sum of its proper divisors (222816285).

668448843 is a wasteful number, since it uses less digits than its factorization.

668448843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222816284.

The product of its digits is 3538944, while the sum is 51.

The square root of 668448843 is about 25854.3776370656. The cubic root of 668448843 is about 874.3582093232.

The spelling of 668448843 in words is "six hundred sixty-eight million, four hundred forty-eight thousand, eight hundred forty-three".