668104206 has 32 divisors (see below), whose sum is σ = 1665923328. Its totient is φ = 173533440.

The previous prime is 668104189. The next prime is 668104211. The reversal of 668104206 is 602401866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 722595 + ... + 723518.

It is an arithmetic number, because the mean of its divisors is an integer number (52060104).

Almost surely, 2^668104206 is an apocalyptic number.

668104206 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

668104206 is an abundant number, since it is smaller than the sum of its proper divisors (997819122).

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

668104206 is a wasteful number, since it uses less digits than its factorization.

668104206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446136.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 668104206 is about 25847.7118136209. The cubic root of 668104206 is about 874.2079170979.

The spelling of 668104206 in words is "six hundred sixty-eight million, one hundred four thousand, two hundred six".