668617313 has 32 divisors (see below), whose sum is σ = 844736256. Its totient is φ = 515144448.

The previous prime is 668617309. The next prime is 668617357. The reversal of 668617313 is 313716866.

668617313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668617313 - 2² = 668617309 is a prime.

It is a super-2 number, since 2×668617313² = 894098222486679938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668617303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 756770 + ... + 757652.

It is an arithmetic number, because the mean of its divisors is an integer number (26398008).

Almost surely, 2^668617313 is an apocalyptic number.

It is an amenable number.

668617313 is a deficient number, since it is larger than the sum of its proper divisors (176118943).

668617313 is a wasteful number, since it uses less digits than its factorization.

668617313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113.

The product of its digits is 108864, while the sum is 41.

The square root of 668617313 is about 25857.6354874145. The cubic root of 668617313 is about 874.4316583517.

The spelling of 668617313 in words is "six hundred sixty-eight million, six hundred seventeen thousand, three hundred thirteen".