668410685 has 16 divisors (see below), whose sum is σ = 839642112. Its totient is φ = 510182400.

The previous prime is 668410681. The next prime is 668410697. The reversal of 668410685 is 586014866.

It is not a de Polignac number, because 668410685 - 2² = 668410681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668410681) 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, 19364 + ... + 41373.

It is an arithmetic number, because the mean of its divisors is an integer number (52477632).

Almost surely, 2^668410685 is an apocalyptic number.

It is an amenable number.

668410685 is a deficient number, since it is larger than the sum of its proper divisors (171231427).

668410685 is a wasteful number, since it uses less digits than its factorization.

668410685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60844.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 668410685 is about 25853.6396857386. The cubic root of 668410685 is about 874.3415716025.

The spelling of 668410685 in words is "six hundred sixty-eight million, four hundred ten thousand, six hundred eighty-five".