666828748800 has 432 divisors, whose sum is σ = 2465235339840. Its totient is φ = 172081152000.

The previous prime is 666828748799. The next prime is 666828748801. The reversal of 666828748800 is 8847828666.

It is an interprime number because it is at equal distance from previous prime (666828748799) and next prime (666828748801).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666828748801) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14261460 + ... + 14308140.

Almost surely, 2^666828748800 is an apocalyptic number.

666828748800 is a gapful number since it is divisible by the number (60) 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 666828748800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1232617669920).

666828748800 is an abundant number, since it is smaller than the sum of its proper divisors (1798406591040).

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

666828748800 is a wasteful number, since it uses less digits than its factorization.

666828748800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46750 (or 46722 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 63.

The spelling of 666828748800 in words is "six hundred sixty-six billion, eight hundred twenty-eight million, seven hundred forty-eight thousand, eight hundred".