668708689 has 8 divisors (see below), whose sum is σ = 739494432. Its totient is φ = 599588640.

The previous prime is 668708683. The next prime is 668708701. The reversal of 668708689 is 986807866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668708689 - 2³ = 668708681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668708681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415579 + ... + 417184.

It is an arithmetic number, because the mean of its divisors is an integer number (92436804).

Almost surely, 2^668708689 is an apocalyptic number.

It is an amenable number.

668708689 is a deficient number, since it is larger than the sum of its proper divisors (70785743).

668708689 is a wasteful number, since it uses less digits than its factorization.

668708689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832847.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The square root of 668708689 is about 25859.4023326140. The cubic root of 668708689 is about 874.4714910163.

The spelling of 668708689 in words is "six hundred sixty-eight million, seven hundred eight thousand, six hundred eighty-nine".