668484561 has 4 divisors (see below), whose sum is σ = 891312752. Its totient is φ = 445656372.

The previous prime is 668484517. The next prime is 668484569. The reversal of 668484561 is 165484866.

668484561 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 668484561 - 2¹¹ = 668482513 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 668484561.

It is not an unprimeable number, because it can be changed into a prime (668484569) 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, 111414091 + ... + 111414096.

It is an arithmetic number, because the mean of its divisors is an integer number (222828188).

Almost surely, 2^668484561 is an apocalyptic number.

It is an amenable number.

668484561 is a deficient number, since it is larger than the sum of its proper divisors (222828191).

668484561 is a wasteful number, since it uses less digits than its factorization.

668484561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222828190.

The product of its digits is 1105920, while the sum is 48.

The square root of 668484561 is about 25855.0683812671. The cubic root of 668484561 is about 874.3737825769.

The spelling of 668484561 in words is "six hundred sixty-eight million, four hundred eighty-four thousand, five hundred sixty-one".