668209206 has 16 divisors (see below), whose sum is σ = 1527335424. Its totient is φ = 190916904.

The previous prime is 668209177. The next prime is 668209211. The reversal of 668209206 is 602902866.

It is a super-3 number, since 3×668209206³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

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, 7954830 + ... + 7954913.

It is an arithmetic number, because the mean of its divisors is an integer number (95458464).

Almost surely, 2^668209206 is an apocalyptic number.

668209206 is an abundant number, since it is smaller than the sum of its proper divisors (859126218).

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

668209206 is a wasteful number, since it uses less digits than its factorization.

668209206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15909755.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 668209206 is about 25849.7428613903. The cubic root of 668209206 is about 874.2537118617.

The spelling of 668209206 in words is "six hundred sixty-eight million, two hundred nine thousand, two hundred six".