6668707123456 has 81 divisors (see below), whose sum is σ = 15485320237989. Its totient is φ = 2857893384192.

The previous prime is 6668707123261. The next prime is 6668707123511. The reversal of 6668707123456 is 6543217078666.

The square root of 6668707123456 is 2582384.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6375827001600 + 292880121856 = 2525040^2 + 541184^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6668707123394 and 6668707123403.

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 8 ways as a sum of consecutive naturals, for example, 289215480 + ... + 289238536.

Almost surely, 2^{6668707123456} is an apocalyptic number.

6668707123456 is the 2582384-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6668707123456

6668707123456 is an abundant number, since it is smaller than the sum of its proper divisors (8816613114533).

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

6668707123456 is an frugal number, since it uses more digits than its factorization.

6668707123456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46144 (or 23066 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 6668707123456 in words is "six trillion, six hundred sixty-eight billion, seven hundred seven million, one hundred twenty-three thousand, four hundred fifty-six".