668708065 has 16 divisors (see below), whose sum is σ = 817335360. Its totient is φ = 525071680.

The previous prime is 668707987. The next prime is 668708077. The reversal of 668708065 is 560807866.

It is a happy number.

It is not a de Polignac number, because 668708065 - 2⁹ = 668707553 is a prime.

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, 242595 + ... + 245335.

It is an arithmetic number, because the mean of its divisors is an integer number (51083460).

Almost surely, 2^668708065 is an apocalyptic number.

It is an amenable number.

668708065 is a deficient number, since it is larger than the sum of its proper divisors (148627295).

668708065 is a wasteful number, since it uses less digits than its factorization.

668708065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3632.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 668708065 is about 25859.3902673671. The cubic root of 668708065 is about 874.4712190143.

The spelling of 668708065 in words is "six hundred sixty-eight million, seven hundred eight thousand, sixty-five".