668067618 has 32 divisors (see below), whose sum is σ = 1346400000. Its totient is φ = 220985856.

The previous prime is 668067611. The next prime is 668067641. The reversal of 668067618 is 816760866.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (668067611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534258 + ... + 535506.

It is an arithmetic number, because the mean of its divisors is an integer number (42075000).

Almost surely, 2^668067618 is an apocalyptic number.

668067618 is an abundant number, since it is smaller than the sum of its proper divisors (678332382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668067618 is a wasteful number, since it uses less digits than its factorization.

668067618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 668067618 is about 25847.0040430221. The cubic root of 668067618 is about 874.1919584581.

The spelling of 668067618 in words is "six hundred sixty-eight million, sixty-seven thousand, six hundred eighteen".