668704849 has 8 divisors (see below), whose sum is σ = 671354600. Its totient is φ = 666061056.

The previous prime is 668704847. The next prime is 668704853. The reversal of 668704849 is 948407866.

It is a happy number.

668704849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 54656449 + 614048400 = 7393^2 + 24780^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 668704849 - 2¹ = 668704847 is a prime.

It is a super-2 number, since 2×668704849² = 894332350152225602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668704796 and 668704805.

It is not an unprimeable number, because it can be changed into a prime (668704847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430927 + ... + 432475.

It is an arithmetic number, because the mean of its divisors is an integer number (83919325).

Almost surely, 2^668704849 is an apocalyptic number.

It is an amenable number.

668704849 is a deficient number, since it is larger than the sum of its proper divisors (2649751).

668704849 is a wasteful number, since it uses less digits than its factorization.

668704849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The square root of 668704849 is about 25859.3280848517. The cubic root of 668704849 is about 874.4698171549.

The spelling of 668704849 in words is "six hundred sixty-eight million, seven hundred four thousand, eight hundred forty-nine".