668188717 has 8 divisors (see below), whose sum is σ = 764142912. Its totient is φ = 572359200.

The previous prime is 668188699. The next prime is 668188727. The reversal of 668188717 is 717881866.

668188717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 668188717 - 2⁷ = 668188589 is a prime.

It is a super-2 number, since 2×668188717² = 892952323052212178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668188727) 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, 19384 + ... + 41377.

It is an arithmetic number, because the mean of its divisors is an integer number (95517864).

Almost surely, 2^668188717 is an apocalyptic number.

It is an amenable number.

668188717 is a deficient number, since it is larger than the sum of its proper divisors (95954195).

668188717 is a wasteful number, since it uses less digits than its factorization.

668188717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62339.

The product of its digits is 903168, while the sum is 52.

The square root of 668188717 is about 25849.3465488008. The cubic root of 668188717 is about 874.2447761536.

The spelling of 668188717 in words is "six hundred sixty-eight million, one hundred eighty-eight thousand, seven hundred seventeen".