668379850 has 12 divisors (see below), whose sum is σ = 1243186614. Its totient is φ = 267351920.

The previous prime is 668379841. The next prime is 668379863. The reversal of 668379850 is 58973866.

It can be written as a sum of positive squares in 3 ways, for example, as 361114009 + 307265841 = 19003^2 + 17529^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6683749 + ... + 6683848.

Almost surely, 2^668379850 is an apocalyptic number.

668379850 is a deficient number, since it is larger than the sum of its proper divisors (574806764).

668379850 is a wasteful number, since it uses less digits than its factorization.

668379850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13367609 (or 13367604 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 668379850 is about 25853.0433411620. The cubic root of 668379850 is about 874.3281264071.

The spelling of 668379850 in words is "six hundred sixty-eight million, three hundred seventy-nine thousand, eight hundred fifty".