668117713 has 4 divisors (see below), whose sum is σ = 676167408. Its totient is φ = 660068020.

The previous prime is 668117699. The next prime is 668117717. The reversal of 668117713 is 317711866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 317711866 = 2 ⋅158855933.

It is a cyclic number.

It is not a de Polignac number, because 668117713 - 2²¹ = 666020561 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668117717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4024723 + ... + 4024888.

It is an arithmetic number, because the mean of its divisors is an integer number (169041852).

Almost surely, 2^668117713 is an apocalyptic number.

It is an amenable number.

668117713 is a deficient number, since it is larger than the sum of its proper divisors (8049695).

668117713 is an equidigital number, since it uses as much as digits as its factorization.

668117713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8049694.

The product of its digits is 42336, while the sum is 40.

The square root of 668117713 is about 25847.9730926818. The cubic root of 668117713 is about 874.2138083180.

The spelling of 668117713 in words is "six hundred sixty-eight million, one hundred seventeen thousand, seven hundred thirteen".