668383642 has 8 divisors (see below), whose sum is σ = 1005102036. Its totient is φ = 333349632.

The previous prime is 668383627. The next prime is 668383717. The reversal of 668383642 is 246383866.

It can be written as a sum of positive squares in 2 ways, for example, as 629558281 + 38825361 = 25091^2 + 6231^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 668383592 and 668383601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420103 + ... + 421690.

Almost surely, 2^668383642 is an apocalyptic number.

668383642 is a deficient number, since it is larger than the sum of its proper divisors (336718394).

668383642 is a wasteful number, since it uses less digits than its factorization.

668383642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842192.

The product of its digits is 995328, while the sum is 46.

The square root of 668383642 is about 25853.1166786521. The cubic root of 668383642 is about 874.3297798810.

The spelling of 668383642 in words is "six hundred sixty-eight million, three hundred eighty-three thousand, six hundred forty-two".