668119809 has 16 divisors (see below), whose sum is σ = 1018451840. Its totient is φ = 381646080.

The previous prime is 668119799. The next prime is 668119813. The reversal of 668119809 is 908911866.

It is not a de Polignac number, because 668119809 - 2⁹ = 668119297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668119849) 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, 99849 + ... + 106329.

It is an arithmetic number, because the mean of its divisors is an integer number (63653240).

Almost surely, 2^668119809 is an apocalyptic number.

It is an amenable number.

668119809 is a deficient number, since it is larger than the sum of its proper divisors (350332031).

668119809 is a wasteful number, since it uses less digits than its factorization.

668119809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11400.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 668119809 is about 25848.0136374152. The cubic root of 668119809 is about 874.2147225033.

The spelling of 668119809 in words is "six hundred sixty-eight million, one hundred nineteen thousand, eight hundred nine".