668753705 has 8 divisors (see below), whose sum is σ = 802859904. Its totient is φ = 534766000.

The previous prime is 668753699. The next prime is 668753707. The reversal of 668753705 is 507357866.

It is a happy number.

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

It is not a de Polignac number, because 668753705 - 2⁴ = 668753689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668753705.

It is not an unprimeable number, because it can be changed into a prime (668753707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16691 + ... + 40200.

It is an arithmetic number, because the mean of its divisors is an integer number (100357488).

Almost surely, 2^668753705 is an apocalyptic number.

It is an amenable number.

668753705 is a deficient number, since it is larger than the sum of its proper divisors (134106199).

668753705 is a wasteful number, since it uses less digits than its factorization.

668753705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59247.

The product of its (nonzero) digits is 1058400, while the sum is 47.

The square root of 668753705 is about 25860.2727170461. The cubic root of 668753705 is about 874.4911130759.

The spelling of 668753705 in words is "six hundred sixty-eight million, seven hundred fifty-three thousand, seven hundred five".