668109858 has 32 divisors (see below), whose sum is σ = 1459285632. Its totient is φ = 202675200.

The previous prime is 668109857. The next prime is 668109931. The reversal of 668109858 is 858901866.

It is a self number, because there is not a number n which added to its sum of digits gives 668109858.

It is not an unprimeable number, because it can be changed into a prime (668109857) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 54783 + ... + 65858.

It is an arithmetic number, because the mean of its divisors is an integer number (45602676).

Almost surely, 2^668109858 is an apocalyptic number.

668109858 is an abundant number, since it is smaller than the sum of its proper divisors (791175774).

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

668109858 is a wasteful number, since it uses less digits than its factorization.

668109858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120730.

The product of its (nonzero) digits is 829440, while the sum is 51.

The square root of 668109858 is about 25847.8211460850. The cubic root of 668109858 is about 874.2103822868.

The spelling of 668109858 in words is "six hundred sixty-eight million, one hundred nine thousand, eight hundred fifty-eight".