668753666357866 has 8 divisors (see below), whose sum is σ = 1003408144302564. Its totient is φ = 334284284923680.

The previous prime is 668753666357857. The next prime is 668753666357941.

668753666357866 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 508125037973641 + 160628628384225 = 22541629^2 + 12673935^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46274118595 + ... + 46274133046.

Almost surely, 2^{668753666357866} is an apocalyptic number.

668753666357866 is a deficient number, since it is larger than the sum of its proper divisors (334654477944698).

668753666357866 is a wasteful number, since it uses less digits than its factorization.

668753666357866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92548255256.

The product of its digits is 197522841600, while the sum is 88.

The spelling of 668753666357866 in words is "six hundred sixty-eight trillion, seven hundred fifty-three billion, six hundred sixty-six million, three hundred fifty-seven thousand, eight hundred sixty-six".