668847666748866 has 48 divisors (see below), whose sum is σ = 1470468993226464. Its totient is φ = 202665995136000.

The previous prime is 668847666748837. The next prime is 668847666748871.

It is a happy number.

668847666748866 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24611455 + ... + 44084226.

It is an arithmetic number, because the mean of its divisors is an integer number (30634770692218).

Almost surely, 2^{668847666748866} is an apocalyptic number.

668847666748866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

668847666748866 is an abundant number, since it is smaller than the sum of its proper divisors (801621326477598).

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

668847666748866 is a wasteful number, since it uses less digits than its factorization.

668847666748866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68709119 (or 68709108 counting only the distinct ones).

The product of its digits is 898948399104, while the sum is 96.

The spelling of 668847666748866 in words is "six hundred sixty-eight trillion, eight hundred forty-seven billion, six hundred sixty-six million, seven hundred forty-eight thousand, eight hundred sixty-six".