666594997320 has 256 divisors, whose sum is σ = 2341788641280. Its totient is φ = 148619520000.

The previous prime is 666594997319. The next prime is 666594997379. The reversal of 666594997320 is 23799495666.

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, 27475195 + ... + 27499445.

It is an arithmetic number, because the mean of its divisors is an integer number (9147611880).

Almost surely, 2^666594997320 is an apocalyptic number.

666594997320 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 666594997320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1170894320640).

666594997320 is an abundant number, since it is smaller than the sum of its proper divisors (1675193643960).

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

666594997320 is a wasteful number, since it uses less digits than its factorization.

666594997320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25076 (or 25072 counting only the distinct ones).

The product of its (nonzero) digits is 132269760, while the sum is 66.

The spelling of 666594997320 in words is "six hundred sixty-six billion, five hundred ninety-four million, nine hundred ninety-seven thousand, three hundred twenty".