668034665344 has 64 divisors (see below), whose sum is σ = 1361783489040. Its totient is φ = 326307844096.

The previous prime is 668034665329. The next prime is 668034665369. The reversal of 668034665344 is 443566430866.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1369359 + ... + 1791985.

Almost surely, 2^668034665344 is an apocalyptic number.

668034665344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668034665344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (680891744520).

668034665344 is an abundant number, since it is smaller than the sum of its proper divisors (693748823696).

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

668034665344 is a wasteful number, since it uses less digits than its factorization.

668034665344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422927 (or 422915 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 55.

The spelling of 668034665344 in words is "six hundred sixty-eight billion, thirty-four million, six hundred sixty-five thousand, three hundred forty-four".