668055568 has 40 divisors (see below), whose sum is σ = 1327379328. Its totient is φ = 325540992.

The previous prime is 668055547. The next prime is 668055601. The reversal of 668055568 is 865550866.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448521 + ... + 450007.

Almost surely, 2^668055568 is an apocalyptic number.

It is an amenable number.

668055568 is a deficient number, since it is larger than the sum of its proper divisors (659323760).

668055568 is a wasteful number, since it uses less digits than its factorization.

668055568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191 (or 2185 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 49.

The square root of 668055568 is about 25846.7709395197. The cubic root of 668055568 is about 874.1867024649.

The spelling of 668055568 in words is "six hundred sixty-eight million, fifty-five thousand, five hundred sixty-eight".