668437646734866 has 32 divisors (see below), whose sum is σ = 1359536455782720. Its totient is φ = 219035701076544.

The previous prime is 668437646734789. The next prime is 668437646734867.

668437646734866 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (668437646734867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286261476 + ... + 288587088.

It is an arithmetic number, because the mean of its divisors is an integer number (42485514243210).

Almost surely, 2^{668437646734866} is an apocalyptic number.

668437646734866 is an abundant number, since it is smaller than the sum of its proper divisors (691098809047854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668437646734866 is a wasteful number, since it uses less digits than its factorization.

668437646734866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137610.

The product of its digits is 84276412416, while the sum is 84.

The spelling of 668437646734866 in words is "six hundred sixty-eight trillion, four hundred thirty-seven billion, six hundred forty-six million, seven hundred thirty-four thousand, eight hundred sixty-six".