666328612267968 has 448 divisors, whose sum is σ = 2019819433820160. Its totient is φ = 192175669850112.

The previous prime is 666328612267831. The next prime is 666328612268003. The reversal of 666328612267968 is 869762216823666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a junction number, because it is equal to n+sod(n) for n = 666328612267893 and 666328612267902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1723621705 + ... + 1724008247.

It is an arithmetic number, because the mean of its divisors is an integer number (4508525521920).

Almost surely, 2^{666328612267968} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666328612267968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1009909716910080).

666328612267968 is an abundant number, since it is smaller than the sum of its proper divisors (1353490821552192).

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

666328612267968 is a wasteful number, since it uses less digits than its factorization.

666328612267968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386976 (or 386966 counting only the distinct ones).

The product of its digits is 4514807808, while the sum is 78.

The spelling of 666328612267968 in words is "six hundred sixty-six trillion, three hundred twenty-eight billion, six hundred twelve million, two hundred sixty-seven thousand, nine hundred sixty-eight".